Would it be possible in some way to hack an apk file to enable billing permission?

Would it be possible in some way to hack an apk file to enable billing
permission?

I have made an Android app using Adobe Phonegap Build. It is complete and
I'm on the verge of submitting it to the Google Play market, except that I
only recently discovered that in order to support the intended business
model that supports the app, that I need to enable "billing" permissions.
Unfortunately, it seems it is not in any way possible to enable the
billing permissions using the config.xml file where Phonegap sets the rest
of the permissions. Billing is not yet, and might not ever be, supported
by Phonegap.
So now I'm stuck and wondering what my options are, or if I even have any.
Is it in any way possible to hack or modify the apk file generated by
Adobe Phonegap Build to enable billing permissions? Is there any other way
I can get the billing permission attached to my app?
(Please note that if it had been possible to build my app in native
Android code, then I would have taken that option from the start, so
please do not suggest that I should solve this problem by rewriting the
app. For better and for worse, this is the point I'm at now. Thanks for
your understanding.)