I'm definitely looking forward to reviews. Like everything...I'm sure it's not for everyone, but I think many will like it.
I think a saw a movie once with a horse getting toked upon. I never thought of that while using the Herbamare though, so they might not be similar.
As for other seaweed, I find the dulse has a lot more flavor than kelp. I've never ground nori sheets, so I'm not sure, but I am pretty sure you will find it's flavor on the mild side. I would imagine if you made a nori roll using a sheet of dulse (if that exists) the flavor of the dulse would probably overpower the other flavors. I would try the Kombu or Wakame. Maybe landarc has a suggestion on those.
If you wanted, you could just use MSG. I think the Dulse tastes better, but the purpose of the dulse is to add an umami flavor, but it also has it's own flavor that is actually really nice as a seasoning. People use it as a salt substitute, believe it or not!