I would definitely stay away from the silicone, those ratings are often times based on air temperature and/or exposure for a limited amount of time. sandwiching one between a pot and the stove sounds like a recipe for a heckuva mess.
One thing that we've learned is that some things work really well on the wood stove and some things not so much.
A pot of ham & beans or other soup that you want to simmer all day is great. If your stove has the not-too-hot upper surface and/or you use a trivet, that works great.
But, if you try to fry, saute, or sear something, you may have trouble keeping the right temp, and I'd hate to think of bacon grease splatters all over.
My wife has even learned to use a wire rack inside a big dutch oven for roasting squash, vegetables, and even baking biscuits.
The silicone stuff I have all say they are only good to 500 deg. F so it sounds like you might end up with a gooey mess (or fire) if the stove gets hotter.