Would HotHands Insole Foot Warmers help?
Consider bringing along shoe-inserts that warm feet. Like hand warmers, but for feet.
HotHands Insole Foot Warmers With Adhesive Value Pack (5-Pairs) https://www.amazon.com/dp/B007BI45KK/ref=cm_sw_r_cp_api_glt_fabc_0GPSPNBWSTQ1D5TC34WW
If you not normally prone to cold toes, then perhaps the issue is the double socks. Make sure you have room to wiggle your toes, and make sure that you are not starting out with your feet sweating before you ever get on the ice. Dont put on the socks, or at least the second pair until right before you go onto the ice.
But here is one thing that can help. Actually 2 versions.
Heated Insole
https://www.amazon.com/HotHands-Insole-Warmers-Adhesive-5-Pairs/dp/B007BI45KK/
Toe Warmers
https://www.amazon.com/HotHands-H162080-Toe-Warmers/dp/B07J33BF7V/
If you go with toe warmers, you can put them under your toes, or on top if that is more comfortable.
One things I will say. You say you are new to curling, without seeing you or knowing you, I will say sweep harder. Sweeping is such an intense cardiovascular activity that you should be exhausted and warm. I like to see sweepers drop a layer of clothing every end or two they are so warm.
But regardless I hope you get your toes warmer so this does not distract from your fun.
Just picked up a pack for Sundays game!