If there were other RCD protected sockets in the area I would just label the cooker socket "Non RCD - unsuitable for outside use".
If the NIC inspector couldn't find anything else wrong with an installation the non RCD cooker socket used to be one of their favorites for a "minor" on the audit. But if you argued your case they would back down.
Did exactly that with one of my jobs that the NIC looked at on Friday, initally he queried it, but as it was labeled 'not for use for outdoor equipment' (Dymo label not hand written) and all the other sockets in the kitchen were on an RCD he passed it (16th ed install by the way)