How little trim are we talking about? You need a decent amount to bother with bubble bags and even then they barely get half the goody off the material used. Same with dry screening for kief tho.
You could get one of those round needlepoint frames from a fabric shop or department store and stretch some panty hose over it to screen the trichomes over a clean dinner plate. Half-asses but you'll get something off it.
Better to go score some ISO at the drug store if they have the 99% and do a QWISO. You'll get almost all your goody and have some decent dabs.