Couple schools of thought here:
Newer guides really dont need to be prepped aside from ensuring the feet are on an equal/same plane. The issue with removing guidefoot material is that now you are exposing treated/coated/finished areas to rust. Ever see the brown spots on guides? Basically pockets of encapsulated rust. If you do prep the feet by removing material treat the bare/exposed material. Clear nail polish etc etc.
In this case Gup. The D thread is going to suit the build best. Go that route, path if least resistance and all that.
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