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I don’t think your meant to be able to remove the axle from any dynamo. Something about alignments if certain elements...?
I’m sure I’ve read about people successfully stripping and rebuilding Shimano and Sturmey hubs though.
If it’s something you really want to do, I’d be looking for posts about servicing bearings on dynamo hubs to find out which hubs people have successfully stripped and rebuilt and going from there.
Do Shimano do a 6 bolt dynohub? My Alfine one is centrelock.
Biggest problem with using a dynamo hub would be changing the axle.