I'd get behind that.
2H on: TV = Nuke, Exo = Ranged nuke
Sword-n-board on: TV is now some shield slam type ability, perhaps with low dmg but a defensive buff, Exo is now shield throw (1 target only, but similar otherwise to current avenger's shield).
Buttons just change icon based on weapon(s) equipped, HoPo mechanics stay the same. Go defensive for getting trained or for tactical purposes, go 2H to go HAM.