I think the issue with termies as a posse is that they are not Fearless.
Otherwise, I say taking Abby in a Raider is already a 'fun' game as opposed competitive.
So it really doesn't matter at that point what you throw in the big metal box with him.
Hell, throw Kharn in there and hopefully he'll attack Abby at the same time as his daemonsword attacks him, at the same time as the enemy models attacking him.....a threeway.....er.... yea....