What brand CNC is it? I bet that most of the cost is in the software 'module' you have to buy. I would look into this, since a touch probe is simply a switch and the software to run it is pretty simple.
I do laser digitizing and have several luthiers as customers. I offer digitizing services. If you don't get your machine setup for digitizing, farming it out to any number of companies that do digitizing in an option. I think there are a few people on here besides me that do professional digitizing.