I checked behind that panel, and yes indeed there are already connectors.
Theres 1 2-wire connector for the speakers, and at least one more connector that was fairly large. I couldnt get that one off, but it was dark, and I was tired.
Much easier to do it this way then to reweld in a new connector. Although, to be practical, the trim panels going to have to stay off. Getting it off is easy, i think one screw holds it in, and then just pry it off. But getting it back in is going to be a pain thats not worth it.
I plan to use some zipties and ducttape to neateneverything up that i can, leaving only the connectors exposed.