What if smiting Gromp gave lifesteal+spellvamp?

Given the current dominance of sustain junglers, why not change Gromp from his current vengeful poison buff to lifesteal? You could even limit it such that you have to have machete/item it builds into to get the buff (otherwise, blue top laners might smite it on the way to lane for early advantages in lane).

The change wouldn't buff sustain-based junglers as more sustain wouldn't actually make them clear any faster. It would, however, help open up the jungle to far more champions than it currently allows.