Will it also be possible to add these jetways to airports from 3rd party developers that just feature static jetways (like e.g. Flytampa Dubai or Montreal or ZGGG)?
It depends how they were made.
If the scenery developer is smart, and made the static jetways as a separate object, they can be excluded just like the animated ones.
Don't know about Dubai, but FlyTampa Amsterdam is made this way so, for example, you'll be able to take a stand at EHAM with a single CTRL+J jetway + a static one, and convert it into one with SODE Double jetways. We are going to publish a video tutorial explaining how to do just that.
If, instead, the jetway is part of the terminal polygonal mesh, there's simply no way to exclude it, other than bugging the original scenery developer that, if he doesn't want to support animated jetways or SODE, at least create a version with separate jetways that can be then excluded and replaced with SODE ones by GSX Level 2.