Killing seeds with a weed soak?

I have some plants which are probably Japanese hedge parsley, but might be poison hemlock. The photos are surprisingly similar. And I'm really not interested in having the latter around, even if there's a possibility it might be the prior. So I've been pulling it. This past season I missed a patch and it went to seed before I found it. I pulled what I could and put it in a bucket, but I really want to dispose of it safely.

I was considering trying a weed soak to let the seeds ferment until rotten.

The standard soaking time for a weed soak seems to be 2 weeks, but I was wondering if I'd need to leave it for considerably longer before I could be confident the seeds were inert.

Anyone have any experience or thoughts?

I knew nothing, but I wondered if allowing them to germinate in a shallow pan and letting them just dry out ofter that would work.
Then I had a look around; temperature-kill-seeds-
"The most effective way to ensure that you kill all of the seeds is to heat them to a temperature above 140 degrees Fahrenheit. Seeds mixed into compost or topsoil require higher temperatures and longer exposure times than bare, unprotected seeds."

I have used a rot barrel in the past. They work, but I don't know the minimum time required. I had some pretty pernicious seeds, so I just left them to rot for several months and dumped out the contents (in a safe location) before freezing temperatures set in.