I've been thinking about penalties that match the injury as well but that would open a whole new can. Would you then suspend the person that takes a swing at a stick only to break a finger? And would that suspension be the 4-6 weeks required to mend the bones?
And then of course there is the concussions that have followed clean open ice hits...should those also be served as suspensions?
I think basing it on the injury to a player is not going to work. You'd then also need to take into account pre-existing conditions. (eg. The next hit on Lindros may end his career, but it wouldn't be fair to suspend a player that hits him for ending his career as it is a culmulation of events).
Just some thoughts..