Wait, just so I don't misunderstand:
0. Be solo player.
1. Backstab enemies.
2. Use last AP to cast chamaeleon skin.
3. Go somewhere to pop into stealth.
4. Wait out the skill cooldown by skipping 3-4 turns.
5. Resume at 1?
If I got that right, then it (namely, step 4) sounds more like a player problem rather than a game issue. You'd just be cheesing the cooldown mechanic in the game. Besides, what would be your proposed solution? Stealth as a combat mechanic is already pretty useless as it is in a party.
P.S. Guerilla doesn't trigger when invisible, only when stealthed. Why? who knows.