Supported Rifle in Germany is one now one of the biggest growing branches of our sport with all the manufacturers making rifles specifically for it, supported pistol is much newer but I am sure that it will grow as big and we shall soon see manufacturers selling supported versions of their match pistols.
Last year at Ulm I had the pleasure of discussing shooting with the CEO of Walther who is a keen sport shooter, he said that the "senior" market is the biggest growing branch of the market for them.
I have seen it shot in Germany at MEC and they encompass and encourage it as one the new branches of our sport and I'm sure you will see supported pistol accesories in their catalogue very shortly.
I think its a great idea to start it here in the UK, stick to the German rules and we have the basis for a new international class, I commend the idea and even suggest that it be proposed to the NSRA.
Best of Luck Bob,
Good shooting
Robin