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Sorry when I first googled your BB it showed me a cup and cone BB, but that was my error.
If it were me I would start tentatively gripping the threads with improvised soft jaws and seeing what parts I could get to rotate and move.
Ndeipi-
No sorries, I had my nrs mixed up and couldve been more forthcoming with info and pictures on which one can actually see something.
@LWaB
The grub screw thing wasn't it unfortunately.
I am trying to rescue it from a taco'd frame so no qualms about taking a drill to it but still no movement.I will try the route of using the lockring and keep pushing, maybe it'll break the I suspect rust bond. The frame didn't have a vent hole in the BB so it could be rusted into place..
Rodolfo
How can I unscrew the cups? The pinholes open up the cup but don't unscrew anything and there is nothing to hold onto to unscrew besides a rag and spanner but you understand my hesitation regarding damaging threads