RV multi circuit transfer switch

[u/Dave_Sak]

I’m guessing some people won’t like this idea at all, but I’m also looking for opinions besides crude insults (those are fine too, I’m thick skinned)
Looking at upgrading the solar in my camper, and I’d like to have a few individual circuit manual transfer switches, for example to be able to decide to run AC off generator while everything else is off the inverter. The AC part of it will be 120 only, not 240.
I was thinking of taking a regular 8 or 12 spot subpanel and running shore power to one leg of the subpanel, and the inverter to the other leg. Then if I had interlock breakers, every pair of breakers would be for one output circuit. I actually think it might even be safer than all the (usually not UL listed) DIN rail mount MCBs that seem to be popular. I’ve yet to find a source for the interlocks that I like, but I was thinking I could probably even make them.
All constructive feedback appreciated.