Not to be too flip about it... unless you're an electrician, get yourself one. Some of those 12v items are wired through a circuit that goes through your ignition - I know.. I'm Mr. Obvious right now.
I think a competent electrician should be able to walk through each problem item and test for power or if there is any other issue to be noted and then wire it to a hot lead. Money will solve this problem, for sure.
Jeff & Sharon Wise
2021 Forester 2151LE-<2020 Jeep Wrangler Sahara
Dripping Springs, TX