6V Zener Driver Series with an XP-E2??

Do you definitely have to have 17mm? If you can go bigger there are some good alternatives. IIRC the LD-29 has some form of LVP but the mounting board is ~21mm in diameter. In fact, MTN carries this driver! IIRC it has configurable modes like the LD-25, but I am not sure and there may be a special trick. convoy-flashlight - video of LD25 output current setting ,wish you success!

Otherwise if you need 17mm and LVP I think you’re stuck either (a) waiting on RMM to restock [which means build more himself] or (b) posting in the WTB section asking someone to build you one since RMM has posted all the information needed for a driver modder to build their own.