Please tell me you did this to a not so expensive machine and not a VMC because id cry if even so much as a spot drill hit my table by so much as 1 micron...lol.
What your saying is a good way of doing it if you dont want to be setting up everytime you take a vice on and off the machine but constantly working in the same area of the machine will wear the guides down over time while the rest of the guides are nice and new.