This is your call. I can't even begin to tell you how bummed I am for ya. Your plants were looking so good- they STILL are- that sucks so bad it's not even funny. You ever get bud with tiny little white/green hard things in it? Those are unripe seeds and they SUCK to get out.
Okay. This is what I would do personally in your situation.
I would chop the herm plant immediately.
Inspect all other plants for herm nanners.
If you find none, or so few that you can go and pick them off daily, leave them to finish.
Allow them to REALLY finish up well, so that any seeds you already have are fat and ripe.
Hint, a grinder that has pyramid-shaped pegs in it seems to be a very effective way to de-seed bud. Grind, dump on a small tray like a sushi plate, tilt it, and manipulate the pile of ground material with the edge of a credit card so that the seeds roll down and away from the ground herb. This doesn't work well if the seeds aren't most of the way ripe, or the plant matter is not fully dry.