Sorry for your trouble. To most of us who never met him, news like this is always a shock.
Ken provided a number of very helpful drawings and measurements to help the construction of my SSM kit for the 800 Class 4-6-0, making the engineering puzzle that bit easier to understand. I'll always be grateful for his knowledge.
Quite funny how there's two generations of the same kit.
Same thing with the J26 / E tank. There are two versions of the chassis - original brass, and later n/s - and some chassis parts from one cannot fit the other, due to the wheelbases coming out slightly different.
The Dundrum starter signal has a lattice post, and might be better represented by the kit from Studio Scale Models, kit ref. S12.
The only disadvantage is that you'd have to build it, but it's a lot closer to the photo than the GWR signal.
The only real difference between these and the Lego couplings is that the Lego mounting arms were rigid, with the magnet discs pivoted horizontally, so they didn't drop unlike the ChrisDraw ones.