In case I was bad at explaining, as I usually am, here's a picture of what and where I meant:14.5 cm circumference when the trigger is fully compressed, so you'll need one that is a bit longer.
I think something easier to tighten and loosen would better serve your purpose. Perhaps a strip of Velcro.
I don't think a coffee filter will allow the blower to function properly. Even on medium, you're going to need unrestricted air flow.

The distance from the center of the trigger to the center of the handle behind it when decompressed was roughly 11 cm* on my DeWalt DCF922.
* Duh, I only measured 1 side, which was 7 cm, and didn't take into account the width as well. >-<
Give me an applied physics problem, and I'll have it solved in less than 5 minutes - ask me anything in theoretical math, and I will ask for the exit...
Next hose clamp size above 58-75 mm is 68-85 mm, then 77-95 mm. They're like 3,5 - 4 USD for a 5-pack, so I can just buy several packs, and find out which size fits. In recommended fashion, I would rather have a tool, but not use it, than need it and not have it.
I was considering velcro, but I figured it would be too much flex in the material. I got some spare velcro rolls, so I can try that as well.
Coffee filter would be for Low and sanding dust only - fleece bag for the wood chips (still Low, I am expecting). And no filter when using the tool as actually intended. Much like a vaccum cleaner, I assume the engine will audibly let me know when it is strained.
EDIT:
Dang it, I made a ~770 USD order like 2 days ago, and now I am currently having another 400 USD worth of stuff in a cart on the same site!
Oh well, at least it's decent quality stuff, with brands like Snickers, Pela, DeWalt, Hestra, Brennenstuhl and Bahco...
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