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MK do this which is a 3 gang version of that: https://www.screwfix.com/p/mk-logic-plus-13a-3-gang-dp-switched-plug-socket-white/17315
Or it looks like you can get single socket RCDs which fit on a 2-gang box: https://www.tradesparky.com/wiring-accessories/moulded/socket-outlets/mk-k6300whi-socket-1g-rcd-active13a30ma
As found on https://mkelectric.presti.media/uk/#page/36-37
Also, look at this bad boy: https://www.edwardes.co.uk/products/mk-k2740whi-4-gang-combination-plate-tv-fm-dab-sat-x-2-tv-bt-4-x-euro-
£90 for the back box!! https://www.edwardes.co.uk/products/mk-854zic-4-gang-47mm-flush-box-for-k2740whi-combination-plate
I cba to get into it, but is there such a thing as a fused spur that fits in a double/2 gang box? Like a fused spur with an adjacent blanking plate.
I'm aware you can get twin single back boxes that are 24mm wider than regular ones.
I can't believe that there isn't something, but I'm really struggling to find anything.