Pipercross and green are the favourites for panel filter replacements. I’ve yet to try smoothing out my airbox and drilling holes in it.
You could try getting a heat shield for the cone filter, but I have no idea where to buy it separately, of even if you can.
Even you had one of those, the cone is still not going to have too much space around it for it to breathe in enough “cold” air, unless your on a motorway, most of the air it’ll be sucking in will be warm, if not very warm. They do sound good though, but on mine, only when I pull away in 2nd or when I’m up high in the revs, which for me doesn’t happen that often.