Grats on finding adaptive techniques!
My mom solved the sheet problem by sewing a tab onto the fourth corner. She put on the other three sides well and could only get about 1/2 down the fourth. With the tab she slides that under (without lifting the mattress) and clips it on the other side and everything stays in place. I have a waterbed and have several pairs of sheet extenders/blanket grips. There are various types, I like the ones with sturdy suspender type ends and gave her a set of those. She sliced them in half so she could make tabs for two sheets from one.
https://duckduckgo.com/?q=blanket+gr...ages&ia=images
Laundry, I got no suggestions
The other day I was washing my kitchen floor. I've got knee issues going on (no getting down on the knee!) and had no sponge mops, so I started by scrubbing the floor with a towel and my good foot/knee... again, another opportunity for me to put on some loud music and try and make the best of the situation. All I can say is it is a good thing I'm rarely caught in action, but should you get a sighting it might be worth it to send to America's Funniest Videos.