I do not run a wired taillight, instead use battery taillight. My dynoub wires are zip tied to my fork blade to the top of the fork where I use a couple 2.8mm quick disconnects, then my headlamp is plugged into those wires. I have some other wire bundled up to keep it out of the way under the lamp bracket. This is on my Nomad.
Even if I had a wire to a taillight, it would not be that much additional wiring.
The reason I use quick disconnects at the top of my fork crown is that I have the original Thorn fork plus a suspension fork that I sometimes use on my Nomad. Also, on my tour a year ago I did not use that same headlamp and I temporarily added a SineWave Revolution USB charger. The quick disconnects are to make switching components easier.
Why do you have a birdsnest of wiring, there are not that many possibilities.