Huge, complex multi-week events need ginormous forward planning. The primary forward planning/booking for an audax like the BCM (with manned controls) depends on site availability.
Ritchie has just planned ahead, in hope, and I applaud that. Company makes these iconic long rides more fun.
I guess it's quite likely that Permanents will be allowed before Calendars. If so, Blacksheep organises (administrates) the BCM Permanent (MR11) which "uses controls [drawn] from the very first event [the Welsh 600] up to the present day but its route is original in terms of the combination of controls used", as follows:
"From a Chepstow depart/arrivee: Usk, Rhayader, Borth, Barmouth, Caernarfon, Menai Bridge, Llanberis, Betws-y-coed, Dolgellau, Newtown, Llandrindod Wells, Hay-on-Wye, Monmouth. The route can be ridden either direction."
My draft:
https://ridewithgps.com/routes/32249809?beta=false