What do you do with winged mounts? I don’t know if i’ve ever seen a
depiction that doesn’t have someone sitting where they’d interfere with
the wings.
You’re talking about the horse pose with the wings over the legs, right?
Personally I don’t think this would interfere with the motion of the wings too too much, birds rarely need to move their wings straight forwards. Instead the glaring problem is: this is the least aerodynamic thing I’ve ever seeeeen
Instead, consider this:
Lying belly-down is the most aerodynamic, causes the least interference with motion, and minimizes the length of the reins; which would otherwise be flapping around in the breeze. The only issue would be your neck getting tired, which could be helped with a saddle chin rest.
Check out the Skybax riders in the Dinotopia books for reference.