Vectric has included a “post-processor” for the Shapeoko (a pair of them actually, one for Imperial measure, one for metric) since v8.5 — please let us know if you have any difficulties accessing them. Their “install” procedure is to move the one you want to move into a specific directory and then that one will be used and the others ignored:
copy whichever of those you would prefer to use into
and then it’ll be the only one you see.
The community has some notes on this as well: https://www.shapeoko.com/wiki/index.php/Commercial_Software#2.5D_CAM as well as links to community-maintained post-processors which have some nifty features.