could you go in throught the soffit on one side of the house, across the loft and out through the soffit on the other side? Much much better than going over and much much less likely to fail
found these in case your wall is plasterboard ( I never knew these existed till now so bookmarked for reference!)
https://www.ebay.co.uk/itm/313427211003
you could drill another hole in the back box offset from centre or if you use a full size box these have four holes in the back and all away from centre
https://www.toolstation.com/made4trade-metal-back-box/p14570
2a socket? If the driver has just a cable connection would an architrave box sunk in the wall covered with a blank plate to conceal the connections work? File a small slot in the edge of the plate to allow the driver cable exit.
Some blank plates have thick edges that can allow a cable to exit via a suitably filed slot. ( I have done it to allow speaker cables to exit using architrave plates) ie...
I don't know what the current capacity could be but would a pull switch like the ones used in sheltered housing etc to activate alarms work,
ie
https://www.tradesparky.com/wiring-accessories/ceiling-accessories/ceiling-switches/crab-2147-ceiling-switch-retractive-6a
Click scolmore do a 4 gang switch and you can remove individual switches and replace them with different switches like intermediate or push.
https://www.toolstation.com/click-mode-10a-switch/p41389
https://www.toolstation.com/click-mode-10a-switch/p71895
take the intermediate switch from the...