OMG it would be so cute and different for Gandalf to have a carriage hahahahaha
So, I was going to suggest that Dwarf-faction Gandalf should have the Word of Power spell same as Gondor Gandalf, as this scene from An Unexpected Journey is exactly that spell (not to say it's one of my favourite scenes):
But I realise beforehand that people will argue it's too powerful a spell for a summoned 7 point hero. So I had a better idea, I suggest that, when summoned, Dwarf-faction Gandalf appears in the center of a smaller range Word of Power spell effect. And then you hear the lines "Take up arms. Fight! FIGHT!"