All you have to do in an EV is use the brake pedal occasionally while still keeping the car set to regenerative mode. Just because regeneration is engaged doesn't mean you can't use friction braking to clean or dry rotors.
There may be a need to reduce or turn off regenerative braking in certain traction conditions, but it is not necessary just to keep rotors clean. (I spent most of my career in New England and the northern Midwest and am familiar with winter driving conditions in snow and ice climes.) In fact, Tesla has removed the ability to turn regenerative braking completely off.
Due to the humid salt air in Florida, any brake rotors develop rust quickly when sitting after a rain or a car wash, whether an EV or ICE vehicle. I engage the friction brakes on our Tesla and our Air to remove the rust after such events all the time without ever taking the cars out of high regen mode.