Why Wizard C3?
The reason most would suggest some combination of Pyro/Linker is because the two classes have good synergy together, JP/HK makes it easier to do damage with the summon, and Sorc lacks low-cd offensive spells to use while your summon is busy attacking. Cryo3 is another build I see fairly often since it also helps you support your summon with CC and gathering mobs with Frost Pillar.
Wizard C3 doesn’t have any real synergy with Sorcerer. A build centered around Sorcerer should have skills that support your summon, but Wizard C3 is a class choice for supporting the caster through Quick Cast’s attribute. Quick Cast doesn’t benefit Summoning at all, and the only skill it works on to my knowledge is Familiar and Desmodus/Evocation. In a Sorcerer-centric build, it doesn’t make a lot of sense to invest two ranks in Wizard for very little benefit to your summon when there are other options readily available with much better synergy (Pyro, Linker, Cryo).
I guess the better question is—are you more interested in a build that uses WizC3, or SorcererC2/C3? What kind of playstyle do you want to have with this character?
If your end goal is to go Warlock or Sage, it might be better to start there and see which classes work best with your final ranks. Having a rank or two in Sorcerer could still be a fine choice, but judging from the other classes you’ve listed, it doesn’t look like it’d be the centre of your build. Sorcerer would just be a utility rank alongside most of those.