I have several friend with different hand issues. All of us use different rotary cutters. I'd suggest you try them out. If you belong to a quilting group ask around and ask to try whatever they have. Or, maybe the LQS could help you,
though I doubt it.
I can't use the newer cutters because I have to use to much pressure. I use the older Olfa, the one with a pistol like grip. I lock the blade in place before cutting the release it after cutting. I can only cut through 2 layers of fabric at a time due to my issues.
Aren't we fortunate we have so many choices. That way we can find what works for each of us.