The rechargeable models can't be rated waterproof (because of the vent hole with a pellet in it)
So that's the 8NX, 8AX, 9AN and 10X.
Also, the G2 can't be waterproofed because it does not have a sealed LockOut TailCap.
All other current models can technically be rated but the chances of getting anything other than the 6PN and a selection of WeaponLights is very slim indeed. So slim that it's not worth considering as an option at this stage if you are member of the public.
Al