For particulates you should use a real N95 instead of KN95. If you want something more permanent try a half-face or full-face respirator with replaceable cartridges. I have a 3M 6297 (https://www.3m.com/3M/en_US/p/d/b10013131/ ). I'm not convinced the particulate reduction is any better than an N95, but it's easier to get a good seal and easier to breathe through, and gives more odor reduction. If doing it again I'd probably get the style with the trapezoid shaped cartridges (https://www.3m.com/3M/en_US/p/d/b5005625039/) instead of the round ones, since there are more choices of cartridges for different classes of contaminant. As an extra benefit, it gets you the stylish Darth Vader look. You can get them at hardware stores or Home Depot since painters and so on use them. I got mine at Office Depot. I think it was $25 or so including a pair of P100 cartridges.

The filter cartridges last a pretty long time but they are way more expensive than N95's, like $10 a pair maybe? IDR, it's been a while.

Don't worry about N95 vs N100/P100, there really isn't much difference under testing. Look up Aaron Collins' youtube channel for a gazillion mask tests from 2020 or so. N95 vs P95 shouldn't matter since the P designates oil resistance which isn't relevant here.

Here are 3M's full face respirators which is the next step up from half face: https://www.3m.com/3M/en_US/p/c/ppe/respiratory-protection/reusable-respirators/full-face/

I don't have one but sort of wanted one some time back.

At least on my 6297, it looks pretty easy to convert it to a powered respirator (PAPR) by removing the cartridges and connecting an air hose to the cartridge ports to deliver filtered air from wherever.

I don't think that would work well. I did a crude thing with a single furnace filter instead of 4 of them and that worked ok though.