Hey @Sabrina, welcome to the forums 
It sounds like you’re already into a bit of biohacking yourself, so hopefully we can provide some resources for you to make this project work. So I looked up some info about Ménière’s disease and it seems that the hearing loss is by no means complete, it’s really more like a side effect of the fluid imbalance that caused the dizziness.
I have been trying to improve upon the existing tragus implant technology for about a year now. Here’s the thread with some of our findings.
The biggest hurdle that has made me put this on the back burner for now is finding a suitable magnet. I currently have an xG3 in my tragus, but it’s strength/mass ratio is far too low to achieve acceptable range from a transmitter. Ideally I want it to be something like a Bluetooth enabled necklace or badge.
You said you have had some success with bone conduction headphones? Which models have you used and where exactly on the head has the contact plate been located to transfer the sound?