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Perhaps all that is needed is... automatics sensing approach to stall .... as the aircraft approaches stall the THS could stop trimming nose up
You mean like the A320 does?
NOD-only true for the 99.999% of the time you are in Normal Law. In Alternate law-Not true. During an upset, you are very likely to end up in Alternate law.
One thing that will interfere with achieving the necessary near 0 g in a nose high upset (which must be maintained until the aircraft is actually nose low and flying again) is an excessively trimmed THS.
(There is a good possibility that the THS trim was a factor in the Air Algerie failure to recover from its stall and roll off.)
P.S. I know you know the A320 systems very well.
