Perma-Cute can be gained from Twink-Ease if you use it for the third or greater time consecutively (i.e. each within 12 hours of the last) while at 40 Femininity. It will lock your Femininity at 40 (which will show as 20% Masculinity in the Codex), which is on the border between 'masculine' and 'androgynous' when it comes to facial appearance; the actual description is
Innocent Allure is exclusive to the Faux-Cow version of the Treatment, which can also grant Perma-Cute. It will boost your Sexiness and stagger enemies on a successful Tease attack, though it does nothing to your actual appearance. Both TFs will TF you towards a femboy (facially and otherwise), though the Treatment won't remove any vaginas present.
No they aren't, but most versions have their own set of mental changes, and only the Cow and Cum-Cow variants feature Intelligence loss. The Faux-Cow variant actually has the least drastic mental changes, and most of the ones that aren't shared with all/most other Treatment variants are optional (requiring being filled with cum after 125 hours into the Treatment).
Lactation will eventually wind down on its own if you go long enough without being milked or pregnant, unless certain conditions are met that are hard to obtain without specifically going for them. For TF-based stopping, Uthra+ when applied to breasts is best, since the other two lactation-stopping TFs (Amber Seed and Mino Charge) are also racial TFs (all three will also reduce breast size).
I think Twink-Ease is a good start towards going for a cute look, you'll just have to shrink your hip and butt sizes a bit and switch your genitals back after getting everything you can from it (especially the Smooth skin flag). For a more feminine cute, also raise your Femininity closer to 60 (shows as 20% Femininity in the Codex) and maybe increase your breast size to A- or B-cups; if you wind up with Perma-Cute, you can remove it by taking 5 or more doses of Estrobloom in a short time period. I also think that Flexibility and Limber could go well with a non-short cute appearance, though they're optional.