HYPERMESH - Selecting nodes via Tag Names

Here's a bit of a challenge and certainly one which has bamboozled me so far...

Our models need to follow a particular numbering system, we already have a code which quickly renumbers literally everything in the model to a specific number range. But an add on we would like is to be able to rapidly renumber specific node numbers. In the models, we tag nodes with a label like 'N-9001' meaning that node number must be 9001 (long story but we work on include files which must slot together so certain nodes must be certain numbers). At the moment this is a manual process but what I would like is a code which could createmark by tag name N9001, then renumber node to 9001.

Can this be done? If so, how?