sucks to hear, hope your hand heals quickly. and at least its just your keyboard hand, idk what the fuck i would do if i broke my wacom/mouse hand, probably be fired within the week :/
Did you break your fingers? Or your palm/wrist? I once broke my scaphoid bone and I had no issues with still using a keyboard or mouse You could also try using a Wacom with lots of custom marking menus or quad menus