I usually always solder, but I got some really nice wire taps for doing the halo lights. They are the kind where you can disconnect them if need be. Basically the same as these ones: https://www.amazon.com/dp/B077YB123S/?tag=wranglerorg-20
Mine are just a little nicer in the sense that they look like they're a bit higher quality.
But other than this situation, I always solder and heat shrink. I just wanted to be able to remove them with ease incase I needed to take the headlights out.
Gotcha my high low harnesses just came in so I want to get these guys in! I think this approach shouldn’t be too bad, if it’s not a pain and you can take a picture of your setup that would help a ton though.