Just been looking at the HH Auction site and this 900SS looks quite interesting, I have never seen a centre stand on one before but it looks like a very useful addition https://www.handh.co.uk/auction/lot...0&au=566&ef=&et=&ic=False&sd=0&pp=48&pn=1&g=1
I know a few people on the Monster forum have adapted ST Centre Stands to fit early Monsters. Perhaps this is another option, as the mounts on the engine are obviously the same.
fitted one to mine, temporarily, about 10 years ago, was a brief discussion on here about affordable work stand alternatives, note of caution, it didn't like a 180 section rear tyre also not happy with new chain and sprockets, interfered with stand cross member on both occasions. (stand retracted)