Just sharing this idea in case anyone else finds the inspiration useful after also staring at ancient POL combo two hole caravan 12V plus TV sockets they never use for years. I’m converting mine into something useful, first off two modern USB type C PD charge sockets and one car cig lighter socket version will follow too. Needed to charge something modern and standard USB doesn’t cut it. Could have been a more elegant job with the plastic work but I used what was to hand, lots of hotmelt plus some thin ABS sheet to mod the socket size. 12V chargers and in-line USB C sockets designed for a different hole size were from eBay, all rather exorbitantly priced, but fancy charging costs I guess. Pic is of work in progress. Not a time efficient method, but solid. Steve