Creating video from images with different SARs with FFMPEG

I am trying to run the ffmpeg command:

ffmpeg -y -threads 2  -loop 1 -t 5 -i watermark-0.png -loop 1 -t 2.5 -i watermark-1.png -loop 1 -t 2.5 -iwatermark-2.png -loop 1 -t 2.5 -i watermark-3.png -loop 1 -t 2.5 -i4.png -loop 1 -t 2.5 -i watermark-5.png -loop 1 -t 2.5 -i watermark-6.png -loop 1 -t 2.5 -i watermark-7.png -filter_complex [1:v][0:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b1v];[2:v][1:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b2v];[3:v][2:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b3v];[4:v][3:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b4v];[5:v][4:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b5v];[6:v][5:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b6v];[7:v][6:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b7v];[0:v][b1v][1:v][b2v][2:v][b3v][3:v][b4v][4:v][b5v][5:v][b6v][6:v][b7v][7:v]concat=n=15:v=1:a=0,format=yuv420p[v] -map [v] -c:v libx264 -r 120 -s 1280x720 -aspect 16:9 -crf 1 -preset ultrafast output.mp4

But, I get the ffmpeg error: First input link top parameters (size 1280x720, SAR 5689:5669) do not match the corresponding second input link bottom parameters (1280x720, SAR 1:1)

The ffmpeg stdout is:

Input #0, png_pipe, from '/media/test/a0201d256f97c39d4f05-watermark-0.png':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: png, rgb24, 1280x720 [SAR 72:72 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #1, png_pipe, from '/media/test/a0201d256f97c39d4f05-watermark-1.png':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Video: png, rgb24, 1280x720 [SAR 5905:5905 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #2, png_pipe, from '/media/test/a0201d256f97c39d4f05-watermark-2.png':
  Duration: N/A, bitrate: N/A
    Stream #2:0: Video: png, rgb24, 1280x720 [SAR 100:100 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #3, png_pipe, from '/media/test/a0201d256f97c39d4f05-watermark-3.png':
  Duration: N/A, bitrate: N/A
    Stream #3:0: Video: png, rgb24, 1280x720 [SAR 11378:11338 DAR 91024:51021], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #4, png_pipe, from '/media/test/a0201d256f97c39d4f05-watermark-4.png':
  Duration: N/A, bitrate: N/A
    Stream #4:0: Video: png, rgb24, 1280x720 [SAR 72:72 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #5, png_pipe, from '/media/test/a0201d256f97c39d4f05-watermark-5.png':
  Duration: N/A, bitrate: N/A
    Stream #5:0: Video: png, rgb24, 1280x720 [SAR 3779:3779 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #6, png_pipe, from '/media/test/a0201d256f97c39d4f05-watermark-6.png':
  Duration: N/A, bitrate: N/A
    Stream #6:0: Video: png, rgb24, 1280x720 [SAR 100:100 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #7, png_pipe, from '/media/test/a0201d256f97c39d4f05-watermark-7.png':
  Duration: N/A, bitrate: N/A
    Stream #7:0: Video: png, rgb24, 1280x720 [SAR 72:72 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
[Parsed_blend_2 @ 0x1d8ce80] First input link top parameters (size 1280x720, SAR 5689:5669) do not match the corresponding second input link bottom parameters (1280x720, SAR 1:1)
[Parsed_blend_2 @ 0x1d8ce80] Failed to configure output pad on Parsed_blend_2

So, I try to specify the SAR in the following command:

ffmpeg -y -threads 2  -loop 1 -t 5 -i watermark-0.png -loop 1 -t 2.5 -i watermark-1.png -loop 1 -t 2.5 -iwatermark-2.png -loop 1 -t 2.5 -i watermark-3.png -loop 1 -t 2.5 -i4.png -loop 1 -t 2.5 -i watermark-5.png -loop 1 -t 2.5 -i watermark-6.png -loop 1 -t 2.5 -i watermark-7.png -filter_complex [0:v]setsar=1[sar0];[1:v][sar0]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b1v];[1:v]setsar=1[sar1];[2:v][sar1]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b2v];[2:v]setsar=1[sar2];[3:v][sar2]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b3v];[3:v]setsar=1[sar3];[4:v][sar3]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b4v];[4:v]setsar=1[sar4];[5:v][sar4]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b5v];[5:v]setsar=1[sar5];[6:v][sar5]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b6v];[6:v]setsar=1[sar6];[7:v][sar6]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b7v];[0:v][b1v][1:v][b2v][2:v][b3v][3:v][b4v][4:v][b5v][5:v][b6v][6:v][b7v][7:v]concat=n=15:v=1:a=0,format=yuv420p[v] -map [v] -c:v libx264 -r 120 -s 1280x720 -aspect 16:9 -crf 1 -preset ultrafast output.mp4

But, I still get the exact same error: First input link top parameters (size 1280x720, SAR 5689:5669) do not match the corresponding second input link bottom parameters (1280x720, SAR 1:1)

That's the first issue. The second issue is that I need to get this command to run with the zoompan filter as well and I have no idea where to even start to get that additional filter to work or where to put it in the command.

Help??