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That length, and the M25 between J23 and 24 which also opened as an A-road, were both ordinary all-purpose roads when opened, as far as I can tell. Certainly in the case of J23-24 the road had not been progressed as a motorway scheme and the decision was only taken very late on to reclassify it, and legal advice had to be obtained by what was then the Department of the Environment about converting it into a Special Road so it could beSo come a motorway after opening.
Those two lengths of motorway might provide a precedent (there are others too, of course) for reclassifying a road as motorway after it's already open. But I don't think the question is whether it can be done; the question is whether the DfT and HE are sufficiently bothered about its status to change it now the road is open. I'm not holding my breath.