[Q] Google Voice integration topic

I am using Google Voice on a Stock VZW HTC One M8 with Android 4.4.4 and I was wondering if there is a way to integrate GV with the Sense Messenger app. I have the GV settings box ticked to show notifications in the call log, and I have the Call settings for voicemail switched to GV. But the Messenger app seems to be tied to VVM. GV seems to be working fine otherwise, so I'm just wondering if anyone knows of a way, either rooted or not, to better integrate GV, I'd be psyched.

As an aside, I have hangouts and the hangouts dialer installed, yet I don't have any setting for Google Voice in Hangouts either. I'm on v2.5 so it should be there. Is there a way to get it or is there a reason it's not supported on this phone?

Thanks in advance!