Kidding! ...Not! Yes I am... sort of! (No, it's better! Shhh! ;))
Anyway, I suspect if the ego clash is going to be like that, it will get to that point eventually, no matter how much you tread on eggshells. As Itsmesilly suggests, maybe just sit down and discuss it with your band. You could site Tommy Lee, for example, as a drummer who also plays other instruments onstage.
The thing is, it sounds like you just want to get somebody else to drum and start playing guitar full time. If that's the case, can you share the stage? If your decision is to stop drumming and play guitar instead, what are you really asking? That's your decision. The reality is, it might take a new band to do it. However, the opposite might be true and you all move smoothly into a 4-piece band.
...so ever since then, I always hang on to the buckle.