Thanks karacho, I will give this a try or some similar variation (after a massive backup of course).
For future reference for folks reading this, if you set OSX as the default boot (Startup Disk), you don't ever have to deal with Chimera. You hold the "Option" key and select the Windows partition to boot and it's there. It adds a few extra steps to boot, but has no negative consequences after that.
Alternatively, regardless of what's set as the default boot disk (Boot Camp) you can hold the option key and go into either operating environment.