To be realistic, an update to the old Teensy 3.2 reference PCB will probably never come. I have no plans to ever work on such a thing. Odds are virtually zero that anyone else would invest their valuable time to update such an old design for custom PCBs based on the discontinued Teensy 3.2 board.
If you really want to make your own PCB design, maybe the old MKL04-based reference can at least give some inspiration, but there simply isn't and probably never will be a more convenient updated copy for the MKL02 bootloader chip. You will simply need to start from the info which is available.