Let me know if you’re able to get it working, would be great to know if it’s possible!
FYI: Looks like they got the Newgrounds player working for AS3, so you can play the games there now! e.g. https://www.newgrounds.com/portal/view/761480
Ah, I was think of using the Newgrounds Player for running the game, but I'm discovering that the player isn't supported for MacOS. Sorry about that!
The forwarder tool might work though, I haven't given it a try for macs. Hopefully it should work.