There are good high-temperature anti-seize products out there, and I use them on my iron and have no issues.
I bought a tube eons ago, and it lasts a lifetime.
This is just the result from a quick search, it's way more than you need - I include it only to note that stuff like this exists.
Amazon.com: Loctite 34517 White LB 8036 High-Temperature Anti-Seize Lubricant, -20 Degree F Lower Temperature Rating to 2000 Degree F Upper Temperature Rating, 8 fl. oz. Brush Top Can : Automotive
www.amazon.com
This specific product is good to 2000F/