This might be an impractical suggestion in this context, but here's my 2 cents worth..
I've been getting increasingly impressed with the hardware that goes into even the cheapest of Android phones (of your interest here, the accelerometers, orientation, gyroscope, even gps?) and the relative ease with which you can pull out that data and transmit it via bluetooth. Its getting to a point where the cheap lesser known brand phones (in my country costing less than 100 US), could be considered as black boxes for the basis of a number of dedicated applications, I think.
Thanks again to Dave (M) and Dave (H) for pointing me towards B4A, BTW!
Check out the 5th line. Orientation values for all 3 axes.
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