Oldbiker, they feel great for balance just a bit lower than standard and I don't feel cramped up in turns and the front is light enough already so haven't wanted to move them backwards. Since I did that mod in the photos on the TY250B it has probably done 10 trials and don't remember any issues with the footpegs hitting anything, so for me they are probably still high enough. I've found that main problem with ground clearance on the TY250 is under the motor as it is among the lowest of the twinshocks.
JC, I made the triangular 5mm steel plates. The U shaped brackets welded to them are from a Sammy Miller Products Universal footpeg kit, which is what I first used on the TY250B. Those footpegs then went onto my Majesty. I had the HEBO footpegs lying around so they went on the TY250B. Most modern trials footpegs fit those same U shaped brackets. The top mounting point for the 5mm plates is the frame lug left after you cut off the standard footpeg mounts. The bottom mounts use existing threaded holes in the frame cross tube (if your TY250 is a B model or later).