Here’s some out of the box thinking!
I’m picturing your tent wedged between your bed and a wall, with opening near foot of bed?
What if you rotated tent 180 degrees, so (I’m guessing) you would have to climb over your bed to get into it. Would that allow your passive intakes to draw air from under your bed? Hardly convenient I’m sure, but would it work for a few weeks?
Or are you about to tell me you have a bed frame that’s solid wood to the floor? Lol!