That's probably the best build for soloing tactician. Dip into Polymorph for Lash, Chicken and various utility. Dip into Geo for Fortify and Reactive Armor. I prefer Pawn over Executioner and a dip into Scoundrel gets you Adrenaline and Cloak and Dagger. Probably want the rest in Warfare.
I'd probably go custom for Dome or Red Prince to Demonic Stare.
The biggest issue with soloing is just going to make sure you get new gear all the time to keep up with the crazy gear curve.
