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Do they make Ethernet coupler locks?
(alien.top)
A wired coupler like this would be better than an RJ-45 coupler. I would put it in a small secondary electrical junction box as well, for weather sealing.
You can use a Cat6 punch down junction box if you have to and can't run a new wire, but you are adding a point of failure. It should still work anyway, just keep the twists as tight as possible to the punch downs and mind the total distance of the Cat6 run from point to point. Another option is terminate it, plug it into a mini switch, and continue on from there to extend the distance and keep signal integrity.
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