As with most above, patch is fine...

My set of oem style 69s have patches
up the wazoo in the orig. Michies. No prob.

I would rec'd that you urge your tire guy to
carefully chalk/mark the tire position on your
wheel before removal & patching, and get him
to remount tire in as near as identical location
around the wheel's circum., as he can; a worn
tire will seem out of balance if it's simply remounted
as he chooses, in my experience.
GL,mD