Sounds like Prunus cerasifera is the generally preferred root-stock, Peach root-stock can also be used but introduces a susceptibility to Peach Borers. Looking at images I would say cerasifera has bark the most resembling mume bark, but there are a multitude of other Prunus candidates that could have promise for that task. Mahaleb cherry also takes on quite charactered bark in advance age, but isn't very common stateside. Prunus virginana grows with a lot of vigor but sends out suckers like its a job and isn't as convincing a match for bark.