i dont have much understanding about sorcerer but…the only reason i see to go for wiz3 its ele2-3 i dont think its worth ele1 only at all.
Sorcerer have large casting times? the only reason that you want to go to wiz3 its because the typical build of elementalist wiz3-ele3-warlock have large cast times in elementalist tier.
I dont think its worth at the moment, the only reason you wanna go wiz 3 its for elementalist 3, you throw a lot of damage skills in other circles because that route.
If you wanna go to sorcerer route with summons, i think you need to go wiz1 and choose other classes that have synergy with the summons.