Interesting question and a bit of a challenge for a good product. For me, I wouldn't want the mat to compensate for the hump. I would want a mat for use with the "ramp" in the up position, ie, assuming a more or less level situation. I wouldn't want additional material or stitching to map the hump.
I assume if you have the pre-IRA binding agreement, you could opt to do a 2024 credit instead, right? Let's say there's no benefit to you for an amended 2022 return, I can't see what would really prevent you from claiming the credit for 2024 instead.
I realize this is not an accounting or tax...