It will take literal minutes to swap out the broken part without needing to break the new part. Most of/all the wiring is plugged into a junction (item 3 in the pic below) just after the cable entry.
Earths and rear wash hose will be the only parts that will definitely need any attention and even that is so minimally difficult that considering any other way is just lazy lol.
You absolutely won't need to de-loom the entire tailgate lol.
Even if you did, there aren't many wires going into the tailgate when compared to something like a door or elsewhere. It will largely depend on which side you brought the wiring in through as to how much work it will be.
Take the trim off and have a look. The best way is the proper way. Take the time to do the repair correctly. Any other way is a bodge and carries a risk of failure. Not always but often.
Also, don't forget that this is a high risk entry point for water and the ends clipping in correctly ensure water resistance. Unless you really want a water feature in your boot/roof lining lol.
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