Just a thought but instead of putting the transformer in the switch mount if you can on the back of the lighting mounts you make? like the one you put into the ceiling, I know in my area anyways as long as you can access the transformer or splices your good for code. Like any normal light fixture the wire splice is in the ceiling and covered with the light fixture and to access all you need to do is remove fixture. Mount transformer on backside of your plywood were wires from ceiling come out, you could even put in a junction box for the transformer and connections, that way you dont need a 6" box at a switch that will be 3 times bigger than needed and not look as good, also if you or someone else ever wants 110 back to that light source they just have to remove the transformer and install different light fixture.
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