They are usually 120v from my experience and I see no reason why a snap switch in a 3r box with a suitable cover would not work.
This is not really a motor load. It is just an AC/DC power supply that runs a DC motor and control system.
The ones I have worked on are fused at 10a on the 120v side.
Opening the battery back up as going to be another switch. You need something DC rated and 15a or so. There is usually a DC off inside the box tho.
It really depends on what they are trying to accomplish.
There is a lockout capability in most gate operators without doing all of this
