Yeah, I never liked adobe premiere either. I use Mediastudio Pro.
I also though MainActor was more enjoyable to use than premiere.
Totally out of my financial reach and the fact it was NTSC only back in the day guarenteed I didn't even scope it into a possible purchase.
As far as getting NLE on a new Amiga... MainConcept started off as an Amiga company, they do a linux version of MainActor. I would hazard a guess they might be willing to cooperate on a port.