Using property P402 is not a very good idea since object ids in OSM aren't guaranteed to be stable. nodes, ways and relations each have their own 'namespace' and sometimes information is refined by moving it from a node to a way or from a node or a way to a relation (multipolygon), usually this means he original object vanishes and property P402 isn't pointing anywhere anymore.

The only way that makes sense is to add wikidata tags to OSM objects.