Nala,
Back in 1985 I actually had my right hand cought in a log splitter and it severed my hand mid palm area because I was placing a log on the splitter when "my brother in law" pushed the lever and I was out of service doing anything for several years.I was Blessed to have it reattached and pinned together.
I still draw with that hand today and I am able to release but I can't open my hand completely.
Now for some unknown reason I never wanted to shoot a crossbow even though at that time I could get a permit but wanted to shoot the vertical bow and needed a release aid.
TSS had a release that had a strap and I could pull with my wrist and release the trigger with my thumb which just got broken in that splitter and I had movement.
I then switched to one with a wood handle that would rotate and I could still use the thump release as the trigger.
After lots of therapy I slowly worked my way back to using just a damacus style glove.
I am not sure TSS still makes that style release but it was my favorite at the time and worked well.
You could rotate 1t 360 degrees as well..
It was called the SY-3 I think.
http://www.archeryhistory.com/releases/pics/tssrelease-s.jpg