Oh sad...
I dont have any clue on coding or whatever....
but i think the spec infected can kill them from the front (at least the tank does)... would there might be a possibility to 'emulate' such a tank blast effect on those weapons maybe?
EDIT: I just tried it. tank and hunter have instant kill, also an front hits
Can't think of how it could be done that way. Infected melee compared to survivors weapons are pretty different.