9 cu ft?,,, yeah, one of those booster fans should work, I would think,, especially that big one you mentioned,,
you could also look at a 4" inline fan meant to hook to a scrubber,,
the odor buckets will work, as will just having a jar of ona in there,, (I love the stuff,, I have 3 jars in my room,, 1 on each light,, and one next to the hole in the light hood where my room exhausts too,, I cannot smell the plants in my room, or in the basement where it vents to.
I just cut 2 plants down last night, and the 15 seconds it was in the hallway made the hallway reek for hours,, but I cannot smell a thing in the room..
anyways a couple of good threads..
DIY Odor Control Bucket
DIY carbon filters
DIY High Flow Carbon Filter
How To Build an Inexpensive Carbon Air Scrubber?