Has any one ever heard of a plate that can...

Years ago shimano stx cranks used a odd way of attching the rings and i think it was middleburn that made an adaptor plate a bit like what your surgesting. Unless you have a cnc lathe wont it look a bit naff tho?

Indeed, and to answer, i have a lathe and a mill, CNC no needs gots my DRO.
3mm ali plate nice.