"It might be the difficult way around, but you can record raw ARINC 429 data. Of course, you'd have to turn that data into something useful which could easily take the majority of effort."
Matthew,
Normally there is no such thing as "raw ARINC 429 data" for AoA. Typically the output from the vane position sensor (usually an RVDT) will be wired directly to the A/D converter within the SPC (or ADIRU in this case). It has a turbulence filter applied to smooth out the slight "buzz" you often get on a vane and is then converted from Vane (the angle sensed) to Body (offset+ratio function) and an Alpha Dot term added. It is this compensated Body Vane Angle that is output to or used by the Stall Protection or Envelope Protection system. [Please note that nomenclature and sequences can vary a lot.] Each step, except probably the Turbulence Filter, can be reverse engineered (post-processed) to arrive at the original value but a the majority of Cert Agencies still require "AoA Vane Angle" - something the reliability numbers don't really allow.