I have the same issue.
So far I've found this link https://bbs.sightp.com/thread-10131-1-1.html
. That guy integrated the 3D render library JPCT and EasyAR following a tutorial to integrate JPCT and Vuforia. It's the best solution so far, but I'm not familiarizated with native development in Android.
Other solution is to use Unity but I'm conserned about performance issues in low end smartphones.
Did you found something else? Please let me know