Hi DozyWannabe,
You are getting closer.
It's also worth bearing in mind that if you're in that situation and don't like what the trim is doing, all you have to do is set the manual trim as desired and avoid making large and consistent pitch inputs on the sidestick
In Alternate Law, even with the stab trim wheel held stationary, longitudinal speed stability is not restored. The elevators will be held at a displaced position in order to satisfy the pitch stable law. (as in Loss of G & Y Hyds on A320, (or G & B I think on A330)). With UAS, the pilot would still not "feel" the aircraft getting slower and heavier in pitch.