Engine harness is junk

Your original question confuses me. You want to rewire it in another year or so, but plan to spend >$150 to totally re-wire it now. What else will you do in a year?

To just get back on the road, wrap exposed copper with self-fusing silicone tape. You can buy at Ace or even at the 99 Cent Only store. Bypass the ammeter in the engine bay. Run the thick ALT and BATT wires straight thru the burned out bulkhead terminals.