Two items of information that weren't mentioned.

RC aircraft switches are two-function, they disconnect the battery from the charge receptacle when the the receiver is powered. Wouldn't want someone plugging in the charger while the receiver is powered.

For easier access with arthritic fingers, you can put that slider switch inside the fuselage and run a short music wire to the outside. Put a loop, or a hook, or a tag on the wire so you can push or pull the switch. You'll notice a hole through most switches, through which that wire can run. I had one plane with a little button on the wire, to grab or push.

Most servo trays I've seen, and many kit & ARF servo setups, include a switch mount, specifically for running that wire to the outside.

Good luck,
Dave Olson