You could think about creating a "Accessible Games Jam". Explane what disabilities you are aiming for and what are potential accessibility features. You could aim for new games with accessible features, or making existing games more accessible, or both ...
I think there are a lot of developers on itch that are willing to try out something new. But I think that it is important that you give some guidance: For the current project I am working on I have no idea how to make it more accessable (except for color-blind mode).