@Martin7318 what's up bud
a while ago I was looking at something similar, I wanted to dry sift some larf to make some hash, asked the question and got a couple options for you,
https://peasysqueegee.com/?product_cat=screens&post_type=product&s=screen
Then the next option would be to contact all your nearest local baking supply stores around you and ask if they can hook you up with this...
If they don't have that cookie silkscreen they'll most likely have this.... - it's a baking sift, not a normal sift, this sift screen is way way finer than a normal sift, but this will still let a lot of plant material through - this might be the same stainless steel mesh they use for the "trim bins"
last resort would be building your own, I looked at building my own silk screen, as you probably noticed, they're not cheap. Much better price than the 1.5K for a "trim bin". finding silk mesh is harder to do than I thought and what I did find was rolls of the stuff with prices way worse than just buying one of those premade screens with aluminium. what I did find in terms of a screen mesh you could use is this 30cm x 30cm screen with 200 threads per inch, very very very fine will do the job you looking to do, but again not cheap, at least you don't have to buy a whole roll of it. then comes the stretching and securing it onto your border.
personally, I am saving up for a set of 3 of those screens in the first option.