It should rename the target UV map when you rename the UV map. But be sure that the high and low UV map names are different, otherwise it'll try and bake both. Bit annoying.
rename this to mcr, put in your macroscript folder, run once. then you can put it on a hotkey Anyways, will convert that PDF to a thread so we can conserve it better, good idea @"Eric Chadwick" ?