You are right about CM3.
The MM quote above said Bulaga would work at LT through the mini camp. He didn't say anything about training camp or beyond. If it turns out that Bulaga can play RT as the starter right away, I would go for it.
Why not put your best players on the field? If it turns out he needs to move to the left side later due to a Clifton injury and he is best backup at LT, then move him there.
I don't believe starting him at RT (if he is better than Tauscher) would stunt his development at LT. In fact, game experience would probably be helpful.
I wouldn't mind if that happened either. Joe Thomas, Jake Long, David Dhiel, Michael Oher and countless other tackles played on the right side before moving to the left.