Hey there,

I'm not disabled but I understand the hand pain and many can probably share their wrists pain and such.
But don't worry about disability, there is many stories about disabled players who managed to clear an ultimate. I believe a player born without fingers managed to beat TEA. Another, mute, managed to clear UWU and unless you use external tools, you have to communicate with your teammates.

I can't exactly guide you but there should be tools to ease the pain, maybe an adapted controller? Adapted keyboard...

It's not pathetic to ask for help, everyone has their own challenges in their daily life, be it physical disability or mental one.
If you absolutely can't find a solution... There is 2 ways to get those precise sightseeing logs.
First is to use the marriage ring, let the other person climb and teleport you.
Second is someone raising you on the lamp (You need to unlock BLU and self-destruct).

It's not cheating but more loop-hole, considering your situation it might be the best solutions.