Micro/Convection Oven techniques---how you cooking?

If you aren't using a microwave mode, but a straight grill or convection mode, there's no reason the thermometer needs to be microwave safe. Same with the baking pans, etc. for that matter.

(Kind of similarly, if you aren't using the heated dry setting, you can wash "top shelf only" stuff on either shelf of a dishwasher.)