Many thanks to everyone who responded! I’ve been reading all the
links and educating myself on the different standards for mesh sizes,
etc. I like making my own tools anyway, so will probably do that. In
my own searches I did find a "Scienceware Mini-Sieve Sieve Set"
offered by several vendors in the $150 range. It had different mesh
sizes, 25, 35, 45, 60, 80, 120, 170, and 230, with 4 polypropylene
holders that you could swap the screens in and out of, in case anyone
else is interested.
Next up: make a small guillotine for chopping the 30 ga gold wire in
more uniform sizes. The idea I have in mind is based on how a pill
splitter works. It would have a razor blade (like the ones used in
scrapers) that could be swapped out when it gets dull.
Many thanks to all who responded!