Charlie..
Final test at 10.5 deg at .15 depth. This was in scrap pine, I'll never use sharp angle like this just a proof of concept. Surprised at how much detail could hold in soft pine. 
Joe....
Viewing post in Inlay tutorial
That's pretty good for pine. Those thin areas at the inside-corners definitely aren't gonna hold up though unless maybe it's embalmed with epoxy resin maybe - stick the wood in a vacuum chamber full of epoxy and pull a vacuum to the epoxy into the wood. Maybe that could reinforce it, or just use a hardwood instead :P
It might be doable with a soft wood with a wide angle bit but then you'll probably get a lot of stringy cuts on there to have to clean up manually.
Thanks for sharing :]
- Charlie