I think that we might be missing the obvious solution to our SS86 Megatron problem. SS86 Megatron doesn't turn into a gun. He turns into Galvatron.
That would be pretty epic! Although, I would be concerned about how they could pull off both characters in one and do it well. Maybe at the Commander level?
![Megalvatron.jpg](https://tfwiki.net/mediawiki/images2/8/8e/Megalvatron.jpg)