I'm still going to go for Scholar, their healing shit looks nice and the support buffs look insanely strong if you can do without the healing pet, plus it seems to be less Stone spammy for soloing. The thing though is I'm not sure they'll end up like this in P4, as I said the tooltip for the carbuncles pets don't match their skillsets, it seems the skillsets are closer to what the old carbuncles were planned to do(damage and tanking) but the tooltips mention healing and support. Also the colors changed on the carbuncles, was Diamond(tank) and Ruby(damage) but is now Topaz and Emerald so I feel they might just change the Carbuncle to do support/heal shit as the tooltips indicate, so you could do the early dungeons with the pet healing only, maybe(probably lvl 2CNJ for Cure obviously too).
Not sure why Cleric stance is available to Arcanists though, considering they get int as trait(so it's safe to assume their main stat gain is going to be int) and Cleric stance is only good for making a healer class into a DPS class, not the contrary, since the stat swap also comes with a penalty to healing(so you can't stack int, then swap it to MND and expect to heal better when you have a 20% penalty on top). I mean why not but it feels fairly worthless, maybe Scholar will have a ton of MND compared to INT then it'd be useful for soloing.