Either turn the whole chunk into hash or do the old school de-seeding method. (Back when our weed had seeds anyway lol.)
-Break it all up, just go nuts and tear that shit up.
-Spread it out on a big ass piece of cardboard or whatever and then tilt one end up then lightly tap on it and gently shake it.
-All the seeds will roll downhill, use a credit card to fold the weed over and over to free up more seeds to roll away.
Seeing as how it's just shwaggety shwank you could even just ISO hash the whole thing:
-Break it all up pretty good.
-Put it in the freezer for a few hours.
-Cram that shit into a big glass jar, like a pickle jar.
-Pour in an inch or two of some 91% Isopropal alcohol. (Red Label usually.)
-Shake it up with the lid on for 3-5 minutes.
-Strain through a fine metal screen. (Not plastic, not a coffee filter.)
-Let it evap and or use a blow dryer on it in a well ventilated area. (Bathroom with fan on works good.)
-Scrape up your reward.
Peace. =)