Jovi:
As others have pointed out, there's usually more to a story than one persons' perspective. I'll be interested to read your response to ArmyVern's question regarding how you are apparently in possession of authorized "alternative boots", and unauthorized "MkIIIs".
As a former Pl WO myself, I can tell you that it would be an unusual individual who would attempt to countermand an MO's prescription. However, interpretation is everything. I can't recall how many Infmn over the years who, having received a chit for being temporarily "unfit normal trade duties" were shocked to learn that they could be the Chief Clerk's (MY) phone orderly, photocopier technician, runner, message taker, or the RQ's stock taker, or the Chief Cooks pot scrubber, or a myriad of other tasks. It all comes down to interpretation, and the vast majority of Pl WOs are savvy enough to interpret orders (medical or otherwise) correctly.
When discussing this situation with your chain of command or your Pl WO directly - be very careful. Do not prevaricate, slant your recollection of conversations, or make accusations - these actions will bite you in the ass, whether your Pl WO is, in this case, mistaken or not.
Roy