Depends on what "servicable" means to you. A lot of these remote models, including the F2R,Meca double button model and a similiar model from OZZO racng, seal their switches in hard epoxy, which makes it near impossible to remove. Had to fix a unit for a mate a few months ago, a real PITA with a mini grinder!
I use silicone on my models, similar to what is in the inside of an ICO unit or inside your CDI unit on your bike. It's sturdy enough not the brake in any way, seals the inside of the toggle switch hole ENTIRELY and is removable with a blade/screw driver if needs be. The KTM model has a plastic plug to fill the hole, not sure if the inside is still with silicone, I doubt it though...