Those shocks that Dave listed on eBay look great but seem wrong length – 216×63.5mm is enduro rather than SJ I think. Haven’t measured mine as yet but old STW thread lists 2011 SJ Triad as 200 x 50mm.
Re what trusty said about tuning the Triad itself, read that its valving is so crude that it’s not worth it?
So looks like – buy an RP23 and get it turned into a compatible one by Mojo for £100 – sounds worthwhile, maybe get it tuned at the same time.
Final option is a newer shock off a 2013 or 2014 SJ, but are these compatible in stroke and e-e length?
Didn’t want to do any work today anyway!