Given the configuration of the engine the possibility of clothing coming into contact with the headers is unavoidable. The same problem often occurs on scramblers running high level pipes. I doubt you can improve on the stock heat shields. Probably best to avoid textiles, or pick ones that are a snugger fit around the bottom of the leg so they don't flap around.
I wear jeans on mine and I often rest my leg against the heat shields to get warmth on cold days. I don't find the heat excessive.
Textiles have poor insulation qualities and can be extremely susceptible to scorching. The first time I wore textiles on my KTM 1290 Superduke I thought there was something wrong with the engine. The amount of heat I was feeling was way more than usual. I even scrolled through the menu looking for the oil temp thinking the engine was overheating. Then it dawned on me I was wearing different clothing. Put on my leathers when I got home and rode the bike again and bingo, radiant heat back to normal.
After 17½ years of (Gen 1 x 3no) Rocket ownership, I've never had this problem until I bought a Gen 2 GT. I've had no problem when wearing leathers, even gripping the tank with my knee doesn't bring my trouser leg near the exposed bit of exhaust at the top of #3. I must conclude that it's possibly because the Camo textile trouser is a bit baggy and it just happened to fold and the wind pushed it into the exhaust. For now - I won't wear the camo textiles, just the leathers - as it looks like I'm not going to get any different size heat shields. Plan B: (already executed) sew a section of plumbers heat-resistant mat onto the trouser leg for when I want to wear them !
I've had my GT since late 2020. I live in southern Arizona and ride daily, year round. I only ever wear jeans and while I've felt some warmth for sure, especially on hot days, I've never burned my leg nor thought of it as really uncomfortable. I've recently replaced my heat shields with carbon fiber ones and they reduce the heat felt on my calf even more. I can see how very loose pants like a rain suit could contact the headers and melt though.
I've had my GT since late 2020. I live in southern Arizona and ride daily, year round. I only ever wear jeans and while I've felt some warmth for sure, especially on hot days, I've never burned my leg nor thought of it as really uncomfortable. I've recently replaced my heat shields with carbon fiber ones and they reduce the heat felt on my calf even more. I can see how very loose pants like a rain suit could contact the headers and melt though.
So on my 25' instead of following others who have glued heat wrap material, I simply folded the layers of 2" wide header wrap, placed the bolts fornthe shield through them.and bolted it back up neat and Kiddy. You can't see anything and nothing falls out. I also did the same for the midpipe shield as well. I was able to get 4 layes to stay put and use the pressure of the heat shield to keep that material in place.