Re: RBM 10
I know you can put a Gotoh in there, but that trem doesn't have as much material on the bass side and will leave a big gap in the route. The Edge is a great trem, but it may be too long to fit in there. I just checked the route on my RBM2 and it is 43mm along the side of the route, where you may have a possible fitment issue into a LoTRS II cavity.
If it looks like it would fit, I'd be happy to sell you the gold Edge from my RBM2. It's in average shape and I was considering replacing it with a brand new trem.