You might be able to "kill two birds with one stone" if you create a "hard" insert for the door opening. If what you describe is what I think it is, below is an illustration. You make a plywood insert (which you would paint white; the illustration is left plain). The hole for the stove pipe also acts as the support for the stove pipe. The edges you will need to cover with something that won't won't "cook" like the plywood may. You can install ties to tie to the tent-door ties to keep the door edges from opening and letting in the weather. The illustration isn't "to scale" and is over-large so that it can be seen. It would also move the canvas farther away from the stove so that putting it into the actual bell should be less of a problem.The bell of my wedge has a door/ opening going to see about trying to place a stove jack that can be removed in between the ties near the top .
The LITTLE BUDDY and the BIG BUDDY claims to have an oxy sensor on board and will shut the unit down if oxygen gets low. I never tested that to see how it worked though.the Little Buddy propane heaters do a reasonable job. Still you have to plan on ventilation or use a carbon monoxide detector to ensure that the air in the tent is safe to breath.
Those work quite well, but you sacrifice the ability to boil a kettle or pot inside the tent (but you don't have to modify the tent either), when the weather is cold or otherwise nasty and you just don't want to venture out to the campfire. The cooking isn't fancy on a small stove the size of an ammo can, but a cup of hot coffee/tea/chocolate and a hot bowl of Quaker Instant Oatmeal inside the tent goes better (imho) than venturing outside to cook when it's 38 degrees and raining.The LITTLE BUDDY and the BIG BUDDY claims to have an oxy sensor on board and will shut the unit down if oxygen gets low. I never tested that to see how it worked though.
"Into each life, some rain must fall."I don't like the added moisture that an un-vented propane heater adds to the inside of the tent .