Well, after going down the rabbit hole of possible options I'm back to square one. The tripleizers are unobtainium, at least in 110 bcd. I went to order a Sora triple fc-r3030-3 in 165mm and they're all sold out. I need some help with options.

I currently have an older Sora 2X 165mm, 110bcd, currently with a 34 on the inside. I don't want to replace the Hollowtech bottom bracket (fairly new BB-RS500 BC1.37x24 road) with a square taper. I'd be happy with a 2x mountain bike crankset that let's me put a 30 or smaller cog on the inside. I'd rather not spend a ton of money but... So, what MB crankset would fit? Are Hollowtech BB's all the same inside diameter? Thanks!

Aaron