Hi and welcome, you could ask in the Discovery board as the best knowledge will be found there.
Don't bother with the D4 harness.
Get the switch and wire it as though they were spotlights with a relay, the LR harness might be genuine but it will be expensive and no doubt a pain in the hole to fit.
Thanks for the advice but I’m afraid that I’m only capable of plugging and playing so would find that probably beyond my realms and capabilities??? Words and pictures are my guide
Hope you've got deep pockets then, plugging and playing on modern vehicles gets expensive and not so much fun real fast.
Good luck.
