I've done this for the same reason, as there's sufficient room adjacent to the recess in the door for the EHU cable to pass both into the same compartment.
I had room in the section to fit one of these ...
(Maplin link to socket here)
From the back of this I ran a cable to the underseat area close to TV shelf so I can run to receiver when needed. From the outside, I easily connect the sat cable when required to this hidden socket, all suitably weatherproofed.
Just as a "PS" Rob, just think of periodically checking the 'F' connector on your cables. A fellow adjacent to me recently overlooked this & the plug had become loose, causing a short which damaged his receiver; the receiver outputs upto 18v to power the LNB on the dish.
I would reccomend the push on F connectors, uses the same cable, but an adaptor that screws on (99p on ebay) saves twisting the cable so less likly to be damaged (also alot quicker setting up).
they use the same threaded socket, but just pushes on,
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