I haven't really looked into your version without nwjs (neither do I have the time the coming months).
But I saw you said cross-platform was a hassle, but also that you use node.js... So have you looked into / @ http://electron.atom.io/?
It "compiles" into mac, linux, windows....
Another idea: Share the source on github and you'll get lots of support I'm sure.
Cheers
@JGM_io