Unfortunately it's not possible as the connector is broken internally after the cap is removed.
Now If you did this yourself, there's a debate as to whether or not the cap and connector can be removed without damaging the connector and then reused. But if Audi or any other service center does it, they'll just charge you for a new one.
I suspect there will be other bits and bobs they will also replace, so expect a few additional parts on the final bill.
Good read here on the Mag Ride Cap Removal discussion -
Hello guys , I have an interesting issue with magnetic ride that puzzles me. Car is mk2 3.2 year 2009 and it has magnetic ride that occasionally works like a charm for even longer periods of time but then all of a sudden it lights the yellow strut dash light and trows error. Next time i get to...
www.ttforum.co.uk
And if interested, you can download the Workshop Manual
here.