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Looking at the cross slide just now, it may not be so bad. I have to step the scale off the side of the casting to get around the boss in the casting, so it should be enough room to get in there with a stubby allen wrench ( sketch below)
Remember you may need some adjustment when you come to check the scale is parallel to the bed. I did this by mounting the Z scale on an additional long flat metal backing plate; it made mounting a lot easier Jo
We need to show the members how easy it is to fit scales to their machines I'll let you tell them how nice it is to use a Lathe with a DRO fitted after Jo