Hello Ryan,
Welcome to this forum and thank you for sharing the work you did. That's pretty clever if you can provide a better sound engine that takes into account the particularities of a mobile environment: small space and integration issues. The sf3 support is a nice addition.
Currently listening to the modulator effects is a missing feature in Polyphone and integrating your project seems a good option. I am already following your project on GitHub.
I am sure the sf2 community will be restored

Regards,
Davy