That probably isnt necessary. Filtering with cotton works well enough. Get some 3 or 5cc syringes, take out the plunger, and stuff a small bit of cotton down to maybe the .5cc mark. Dont pack it down, leave it fairly loose, and with some implement push it all the way to front (or bottom depending on your perspective) of the syringe. In a separate clean container, mix your crushed pill with maybe 1-2ml of clean water (distilled or bottled water is ok for this purpose). Pour the slurry and pill mix into the back of large syringe with the cotton in it, and insert the plunger, and force the slurry into the cotton, while collecting the filtered liquid into a new clean container. The liquid should be clear, but will be colored with the dye the pill is colored with.
Draw up this liquid into your plugging syringe. This will filter it down to maybe 10-40 microns, which is fine for plugging.
But of course, no harm in using a .22 micron filter, but it will get clogged up give the large amount needed to filter. You could also filter the cotton filtered solution for extra filtration.