I'm pretty sure I have seen suggestions about using a household vacuum cleaner to suck up and blow out down. I think the person fitted a paperboard cylinder, such as a paper towel insert with some sort of fine mesh (stocking, maybe) as a stop for the down, over the vacuum's intake tube. Reverse and blow into the baffle. I also have seen suggestions to set up in a bathtub with the curtain drawn to help contain the down. The bathroom has more room and maight be easier to clean than a small tent.

Good luck!