John,
Genghis' suggestions are the main ones I thought of too, however another is the Victa AirTourer. This was an Australian design which was imported by a Gloucester firm in the 60s and 70s, which had a single sidestick - albeit mounted between the seats with a spade handle so that both cockpit occupants could fight over the same device! Probably whilst wondering if the 100hp would get the rather heavy two seater over that hedge getting ever closer...
I flew it years ago, and from my very limited time in it I remember the lateral control forces as being quite pleasant. The mechanical flaps did also act as inboard ailerons whe retracted, though. I only ever flew it from the LHS, so cannot comment on what it was like using the stick from the right. It was used for training ab-initio PPLs, though, and I know at least one instructor who loved it.
Not really the same role as you and RN are investigating, though.
The same basic design was, I understand, modified, re-engined and used for basic training in the RAAF (AirTrainer?), although I don't know whether the modifications changed the flight controls.
If you are interested, the best person I can recommend to get you started on information on this aircraft is the Chief Scientist at Boscombe (BDN x2329); he has access to one on rebuild on site which is sufficiently disassembled at the moment to easily show the control runs etc. You could drop in if you are down the road at Old Sarum viewing the Shadow and SkyArrow.
Hope that's of some help.
Regards,
BossEyed
8-)