no, this is going to be a commercial work. ...

Unfortunately they recommend using HTML or Word, neither of which finale supports....

anyone?

No, that's incorrect. I already did an experiment where I exported to epub from finale and then converted to mobi using calibre and the music looked fine. Unfortunately, the text didn't render...

Kindle uses mobi, not epub but the conversion to mobi is problematic using calibre. I'm not sure what is out there that is better though....