If it's a puck light you are referring too, they sell this one on Amazon:
https://www.amazon.com/gp/product/B0...XT6XRPY75&th=1
We haven't installed it yet, but an RV friend recommended it - we are thinking of getting it for our bedroom slide, as we don't have a switch there either, and I almost have to stand up on the bed to turn it on....plus it's a super bright light that is currently there - definitely not a night light like we had in our previous RV.