I have worn a bone conduction hearing aid for over 30 years (with an alice band) and glasses for 10 years. I also have microtia (on both sides, asymmetrically), but do not have quite as much difference in vertical placement of the ears as you have described.
The addition of glasses is still somewhat of a challenge, and I do not have any quick solutions for you. That said, here is how I have handled it and some suggestions.
First, you may have to straighten the ear bend in the frames of the glasses. In my case, I have straightened both sides of the frame, and the glasses are held on fairly well by sliding the frames underneath the alice band (the tension of the alice band against the head helps to hold them, as does the non-slip design of the nose piece of the eyeglass frames [standard frame construction; nothing unusual]).
Regarding the alice band…my mother always covered my headband: first, she wrapped it with a thin layer of padding; then, she covered with a slightly stretchy material (the stretchiness is helpful in sewing the cover on). To the cover, she attached a stabilizing band in the back–simply, a narrow strip of durable fabric (consider bias tape or something similar) with one end attached to the bottom of one side of the alice band fabric cover and the other end attached to the bottom of the other side (above the conductor mount/swivel). The loop in the back rested under my hair, against the lower part of the skull, and helped keep the alice band safely in place through the various runnings-around of an active, curious child.
If you covered the headband, it might be possible to attach some kind of “loops” or “guides” through which the “earpieces” of the glasses could be inserted. It might also help to hold the glasses on with an elastic strap that stretches around the head (think of safety glasses/goggles). I tried this briefly, but discontinued usage as it did not improve the fit of the glasses in my case.
Xbulder (the previous responder) is correct to recommend looking into BAHA (bone-anchored hearing aid). This has recently been recommended to me as well. However, after having functioned well to date without it, I personally am reluctant to undergo the surgery (although I am interested in hearing the experiences of those who have known both sides: bone conduction and BAHA).
I hope that sharing my experience has been of some help. Please feel free to contact me via the private message capability of this forum if you have any further questions.