Hi Melissa: Welcome to Permies!
A glowing stove pipe is always something to get nervous about.
In my opinion your hubby is overloading the stove. But, be that as it may.
His idea of insulated pipe is expensive but would be much safer than glowing orange pipes. You would feel slightly less heat in the tent as well.
Are you guys aware of
rocket mass heaters ? One with a bench that doubles as your bed and your couch? Sit on it , stay warm , sleep on it , stay warm, In place of the stack of
wood you guys burn getting too hot, you would burn a few pieces instead. No fire all night , stay warm , burn much less wood … If you can't tell I am a big fan of
RMH's.
I realize your living in a tent, space is limited, building a
rmh takes some time, but maybe this might be worth your time to look into? Summer is coming but next winter is right on its coat tail...