I personally think it is a great idea!! I have never mastered the art of crochet, but my DM was wonderful w/ it. She also had FMS, I believe, plus arthritis. She felt it helped her hands so much. She made such beautiful afghans. Each new baby got a gorgeous afghan when they were born. Plus the ones she made for us as we got older. They are my treasures.
She learned from her favorite aunt, and then turned around and taught her own mother. Then my DM & DGM would 'find' new patterns and share them. lol
My DM said she felt it helped her keep her mind active when the rest of her couldn't be active. It kept her hands moving for a lot longer than they would have w/o the 'exercise'.
My DM completed her last afghan when she was 90 yrs old.
You have a talent & a gift, use it & enjoy it - on ALL levels!!
God bless. Alice.