Liquid weld recommendations

I'm not sure I follow...if you grinded off screws, why not replace the screws?

Grinder off the heads. Remainder still fills the holes. I really don't want to drill them out.

Neither do I. JB-Weld Highheat is rated at 400 degrees continuous and up to 550 degrees intermittently.

If you ground off screws, the first thing you should attempt to do is replace it a SS screw or maybe drill it out and put in a nut & bolt or, maybe, a stainless steel Pop rivet?

I would really worry, depending upon where the repair is made, about failure during use and the fire hazard or just trying to implement the famous (in infamous) "3 Second Rule" when those nice steaks are on the ground. ;-)

BLUE MAGIC quick steel extreme high temperature metal repair withstands temperatures up to 2400 degrees Fahrenheit, 1300 degrees Celsius, sets in five minutes, steel hard in 15 minutes, full cure in one hour. It can be drilled, tapped, file, machined, sanded and painted. Withstands direct flame, welds holes and cracks in iron and steel.

Stainless steel screws.

I would suggest drilling out the rest and replacing with screws but if you're adamant on epoxy, the Blue Magic suggested by JW is a good option. I've used it with good results but not with high temperatures you seek.

doubt there is any jb weld would go up that hi but check their site

but before that check craigslist i see good grills on there all the time maybe people are eating more plants now although grilled plants are good too