Maybe one of these would help?
https://arachnigrip.com/product/slid...-beretta-92fs/
I have an injured support hand, with very limited mobility, and this has helped quite a bit on the M&P's and the new 365 .380 that I have.
If I want to lock the slide back I usually will transfer the gun to my other hand . . . not sure if that would be okay in the situation you describe.