It's easy, get a custom made - no problem easy peasy, eith get SSG, Hamilton, Huggett etc to make one or buy modules and have a suitable stainless plate made by your local fabricators - we order them and occasionaly make them a lot for commercial premises, but you pay a premium for one offs.
How about ripping out the triple gang box fitting a double and a single next to it and having a double and single outlet - or go mad and have two doubles
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