I upgraded my super racer to a volcano style copper heat block without any issues. You just need a new silicon sock to go with it. I bought this one https://www.amazon.com/gp/product/B08NV8JHNJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

If you are aiming for absolute maximum speed/acceleration I think the copper is overkill.

The FLSUN heatbreak is not threaded. So that rules out the threaded E3D style heatbreaks. Without tearing mine apart to a make a direct comparison, it does look very similar to the one that comes on the Ender printers I have. So finding an all metal or Bi-metal one shouldn't be too hard. Be careful of the length of the new heatbreak, as it determines the nozzle Z height vs the platform.

You could get an E3d Style heatsink and machine the threaded holes in the bottom yourself if you want a threaded heatsink.

My opinion on high temp materials: retraction/stringing become a hassle because of the metal heatbreaks and all the higher temp printed materials need to be printed slow and in an enclosure. This makes delta printers kinda lame for high temp materials. IMO just get an ender with an enclosure and metal heatbreak and use that to tinker with exotic materials.