Although converting a GPS (or geopoint) to UTM is technically possibly, it is not a simple calculation - eg see https://github.com/hobu/mgrs/blob/master/libmgrs/utm.c:Convert_Geodetic_To_UTM() for an algorithm. As such, it would likely have to be implemented as a new XPath function in javaRosa/ODK Collect, before being picked up it KoboCollect. And, if the compelling usecase for adding such a new function is calculating distances - which can already be accomplished via the existing distance() function - then it probably wont be given a high priority by the ODK development team.
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