Furnace problem

Have a used Carrier gas furnace I'm setting up in my shop. Has electronic ignition, spark type, and has a ill designed bi-metal switch that assures the pilot is lit before allowing the main burners to come on. See eBay # 120079668335. Anyway, the switch is bad and a new one is not going to happen. I feel it's a poor design at best and it's expensive to boot. Any ideas on how I can rig this to work some other safe way? The spark ignitor and pilot work fine as is. BTW: The switch needs to be SPDT.
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