I didn’t fully understand the metzius you’re describing.
I assumed your “pourover” is simply pouring hot water over the grounds, similar to קפה בוץ “mud coffee” they make here in Israel with Turkish coffee.
But how does pouring over grounds for with a plunger? Are you first pouring and then “plunging”? Is the hot water in the plunger? I don’t really grasp the scenario here.