I installed the kernel, kernel-modules and kernel-flasher packages linked-to in your post, and performed the following test sequence.
1. Connected BH-214 headset via Bluetooth.
2. Started music playback on stock player.
3. Used pause/play button to pause and restart music.
4. Used answer/hang-up button on headset to answer incoming call, and then used answer/hang-up button again to end call.
5. Initiated outgoing call from handset dialler, then used answer/hang-up button on headset to end call.

In all cases, I observed correct functionality. Music playback paused and resumed automatically with no degradation of sound quality. Call quality was satisfactory. My conclusion is that the BH-214 headset works correctly with this kernel.

Many thanks for your work. A final question: is there a version of the kernel-power-settings package which is compatible with this kernel?