Kevin as said I don't think I have ever seen one done in such a manner! The contrast between the two woods is very intriguing and I see it opening up a whole new line of handles.
I think in the future I would consider internal pins or something similar to a biscuit between the two. One of my biggest concerns is the thing with all woods,
wood comes and goes. That is one reason most folks like to use stabilized wood, it moves very little. However it does move.
I have used it on a handle and everything will be 100% flush. I happened to get my hands on one of my knives I made for a friend a year or so after I made it. It was made during the winter, when we have less humidity around here. I handled the knife during the summer months and when I put my hand on the handle I thought I could feel the handle standing proud of the blade. Looking at it I wasn't real sure. However like a razor edge on a blade, you really sometimes can't see it with the naked eye, but you can catch it with your fingernail. So doing the fingernail trick I could tell the handle had indeed swelled ever so slightly. So knowing wood and the humidity around here I was not entirely surprised!!
Now I asked him had this handle always been doing this?
His response was doing what????
I smiled and told him,..............nevermind! He was a bud I didn't charge him for the knife afterall it was a gift!!
So lesson learned all wood moves and when buying stabilized wood make sure it is from a reputable source.
EBay may not be your friend in this case! Ebay always pops up under a Goggle search saying we really do have everything at EBay. However you may not want it!! LOL
After having said all of that I still do like the world you are opening up with the design of that handle!!