Neat idea, but like you said, it’s “too op”. but since you’re asking us, what the most op combination would be. If you can combine 3 procs into one weapon I would choose; For warrior would be skull axe/dozer aegis/maul of Ollerus proc.

But in order to counter this weapon proc combination, you would also need to implement “armor argumentation” for example add Death engine helmet+Death engine helmet= Death engine helmet V.2. And death engine helmet V.2+death engine helmet V.2= Death engine helmet V.3

Example:
Death engine helm=60 str, 15.0dmg, 5k armor
Death engine helm V.2= 80str, 21.0 dmg, 7.5k armor
Death engine helm V.3= 120str, 30.0dmg, 11k armor

So you can counter op proc with op stat.