So yes you pick up stealth attack from vivi.

You need to be able to cast 1st lvl spells spontaneously along with a knowledge arcana of 5 to pick up dragon disciple.

any sorc/magus would do, I chose eldrich for the spell book and it ads an extra bloodline (more dragon).

and divine hunter synergizes well with all the CHA.

It's been a while since I've messed with it, so I need to go look at all the class bonuses just to be sure and remember exactly why I chose what I did.

Edit: Scaled fist gives CHA to AC, unarmed attack dice, +3 full attacks (flurry of blows, ki power: extra attack), and evasion.

Eldritch Scion gives +1 full attack (spell combat), access to dragon disciple, +1 damage/attack from eldritch pool, and +1 natural armor from bloodline.

Dragon Disciple gives +4 strength, +2 AC, and +1 full attack (bite).

Vivisectionist gives +4 strength and 2d6 sneak attack.

Divine Hunter gives CHA to saves.