Thanks Mikekan13. At this time, it's still a while a way to be honest - various issues (including business development) has taken my focus away from plugin development. It's quite probable that I'll be detouring from plugin development to making a game out of it first, so that I can fully understand the sort of issues that one would face in a real development situation - ultimately making for a cleaner, more robust plugin when it's released.
At this time, the VRTK is still a great go to for Unity VR developers, and it features an in-place locomotion solution as well (albeit with a different feel to the one in Freedom Locomotion) - which should serve as a good base to experiment upon! Good luck!