Thanks elgarev, but credit where credit is due: Dorin developed the complex SQL, I just wrapped it in a plugin.
I'm hoping to enhance it to be able to roll back more than one adjustment, if I can figure out the requisite SQL code.
UPDATE: Dorin provided the requisite SQL for undoing multiple steps, which I folded into v1.1:
http://www.robcole.com/Rob/ProductsAndServices/MiscLrPlugins/#ScrewAut oSync
Cheers,
Rob
