Isn't it a big project? Can't you get paid support? This is really depressing to read, especially for me as I may be developing for BB10 in a few weeks.
I've developed native apps for BB10. The tooling is decent. It's a bit heavy since it's based on Eclipse but I had no problems with it. You can also use QtCreator with BlackBerry 10, but I've never tried it. You will mostly use Qt-based APIs anyway in your app, so there's no issue with support. The documentation for BB10 Cascades APIs is very good. There are also lots of official and community submitted samples on Github. For questions I've always used their developer forums which were active.
If there is a god he will deliver me from this place.