Disclaimer: I worked for Desert Highlights 7 years ago guiding canyoneering trips. Matt Moore, the owner, was an awesome guy to work for. I haven’t spoken with him in years, and have no other interest in his business succeeding.
That being said, it’s neat to see that someone is offering guided multisport adventures using packrafts: http://www.deserthighlights.com/trips/packraft/packraft.htm
I’ve done all the segments of both trips listed above, albiet not with a packraft and not as a continuous trip. I’d do both in a heartbeat now, especially the bikerafting one (though it’d be easy to bike back and close the loop).
One more resource for folks to try before they buy can only be a good thing.