Design, build and install your own if you like to bring a bit of spice into your life..... Took me ages though but now I have sensible fuses in sensible places, relays to take the load out of 50 year old switches, 12volts at my headlamps, cut-out circuits, plumbed in electrics for a trailer etc etc. The new looms you can buy only replicate the limitations of the original design (for a 1960s van).
If making your own isn't something you want to do then I'd suggest exploring options with a auto electrician that knows what he/she is doing. A new loom with adaptions might be a solution