There is a new OO9 coupling now available from New Zealand Finescale that reasonably replicates the prototype Lynton & Barnstaple Railway central buffer and drawgear. Two versions are available, plain boss fitting and NEM fitting.
Note the supplier has two more chopper couplings available.
The OO9 couplers webpage...
https://nzfinescale.com/product-category/oo9-couplers/
The L&B plain boss coupler...
https://nzfinescale.com/emporium/detail-parts-other-scales/l-and-b-oo9-couplers-plain-boss-fitting/
The L&B NEM coupler...
https://nzfinescale.com/emporium/detail-parts-other-scales/l-and-b-oo9-couplers-nem-fitting/
The NZFS guide to their OO9 couplings...
https://nzfinescale.com/wp-content/uploads/2019/05/Couplers-for-OO9.pdf (https://nzfinescale.com/wp-content/uploads/2019/05/Couplers-for-OO9.pdf)
Well found Chris! I'd heard about their larger scale (1:64) couplings and that they were thinking about something for 1:76 but not that anything was on the market yet.
Thanks for the information - particularly their guide in your last link.
That's most interesting. They look good fitted to the Peco 4 wheel stock. Something to consider if/when I get a permanent OO9 layout built!
Best part is they're local :D