Is there a component like terminal block that would allow you to create a power rail?
There are quite a few here: https://www.perfprotech.com/terminal-blocks-bus-bars/category/5492

I can't vouch for the site, and I'm not sure I would recommend buying from them, but yes -- the parts you describe do exist.

It appears the "DualBus" product line is made by Blue Sea Systems (if I'm understanding correctly). Perhaps that's an option you would like to pursue?