When reading your post, it sounded as if your desire was to make use of a probe rather than have to roll your own software. If you'd prefer a software package wich already integrates probing support, you may be interested in taking a look at MachStdMill at Calypso Ventures, Inc.
I believe MachStdMill (MSM) has the best probing support available for Mach. Of course, I'm the author so I suppose I could be accused of a slight bias...
Basic probing ops (edges, surfaces, corners etc) necessary for setup are in the release version, for the extended operations (pockets, post, valleys, ridges & A&B axis alignment), see the current beta release. The software also includes auto measurement of tools and setting of TLOs so it could save you that task also.