ScummVM now supports Wetlands. You'll need a daily build to play it.

https://www.scummvm.org/news/20220506/
https://buildbot.scummvm.org/#/dailybuilds

Does this make the entire game playable?

The game is currently in public testing for ScummVM. Which means we do expect it to be playable to the end, but also there's an open call to players who will use ScummVM version 2.6.0 or develpoment 2.7.0git to play the game, to provide their feedback of any issues encountered and/or verify that it indeed it's entirely playable.

Thank you.