I own an old Gretsch clipper that has been pinned into position the intonation doesn't move at all but i would probably shit myself doing that to one of my guitars in case you got it wrong
generally i get the bridge intonation right then very carefully and gently dot the four corners of the bridge with a water based marker pen,then either place a thin film of blue tack or two sided tape under the bridge area then replace the bridge carefully this usually holds it all in place for the next string change,i have also used an Ibanez half ground brige to replace the roller bridges you sometimes find on old gretsch's,i just put the original in the case,although nowadays its not as m uch fannying around as mdern guitars are made with this in mind......alternatively you could pay someone to do it for you