General :: Send All Music / Audio Over DLNA?

I'm very much interested in being able to send my music/audio from my phone to a DLNA renderer on my home network. There are plenty of individual apps out there to do this, such as BubbleUPnP, Twonky, etc, or even indeed the music app built in to my HTC One X. However what I'm wondering is if there's a way to have all music/audio re-directed over WiFi to a DLNA renderer?

What I'm looking for would be something similar to when you plug in headphones or connect a Bluetooth audio device: any application that plays media has the audio directed to the headphones or bluetooth connection, instead of the internal phone speaker - that's exactly what I want, but with the audio being directed over WiFi to a DLNA renderer. I'd configure the app/service/whatever to send all audio over DLNA, and then it doesn't matter whether I'm using Dogcatcher, Spotify, the built-in Music app or Google Music - all audio automatically gets directed to the DLNA renderer.

Having to use yet another app on top of the various media applications I already use is a real pain; plus I highly doubt any of the existing applications will support Spotify streams (Twonky and BubbleUPnP don't), and I had little success when experimenting with Twonky yesterday. As mentioned my built-in music app already does this so I'm already part of the way there, but I'd like it to be system-wide rather than app specific.

The DLNA renderer I'll be using will either be a standard PC running XBMC, or a headless Raspberry Pi embedded Linux computer; either way they'll both be fully UPnP/DLNA compliant.