First, thankyou for that very informative post.
This bit is just astonishing!
The reason why the AWSMDS never entered service on the F3 was because by the time that a decision had been made to clear it (and all of the airframes had the system installed at manufacture then inhibited) the programme had slipped by a financial year (or was it 2?) and there was no funding for the maintenance test sets to be purchased so it was never activated. The Saudi ADVs, however, did have it activated.
Bean counters!!