Wizzard has some quite jice buffs and debuffs to engage mobs in combat. The last time we could shouw our support and sustain potential was using the famos Chantodos combo during vanilla. My ides is to create a supportive Wizzard using the current meta.
Yes it isnt a great deal to speedrifting. I was aming for the higher rifts. The buffs provided by the Wizzard and the debuffs + additional controll might be of use. But as you say, the current meta is about wd/barb/monk. I think the defensive bonus and defensive gems could provide anough survivbility in combination with a heal monk it might replace the support barb but it is a quite high aim