quickly made this tool out of some code by mefisto that parsed a dk2 map and implemented Adikted into it
written pretty quickly and only does slabs and their owner so no objects, creatures, scripts etc.
to use place files in zip in Dungeon Keeper 2\Data\editor\maps
then run 'dk2mconv MAPNAME d' in command prompt from that folder
note it edits the map in the levels folder instead of making a new one and is hardcoded to map 000001 so there has to be map files there before running it and will kind of overwrite whats there
done pretty quickly might contain bugs
dk2mapConv.zip
https://github.com/PieterVdc/dk2_mapconv