Probably more headache than it’s worth. But this thread might give you some input on crossing vehicle wires
I'm going to attempt to explain this along with everything else I've been through dealing with these different taillights. There's not much info any where on these lights or the vlands other than people complaining about them just a lot of useless info. So I will share what I've done. First I...
www.tahoeyukonforum.com
Somewhere in the post it says he gets turn signals from tapping into front headlights and run them all the way to the tail lights.
edit:
There are also harnesses that kind of mimic this
they convert 6 wire lights to 4 pin trailer connectors. Which is kind of exactly the situation you’re in right now. You could probably wire the converter behind the light and do it that way. Google 6 wire to 4 pin trailer converter