"You can connect 2 of your Retro Joysticks to your SAM Coupé with this 2 player adapter, it fits snugly into the joystick port and offers 2 Atari/Amiga/Kempston pinout joystick connectors."
Debuting at RetCon in May 2025, this new joystick splitter came about following a demonstration of the flawed MGT/SAMCo joystick splitter at a meeting of the Greenford Computer Club the month before.
It uses a couple of buffer ICs rather than diodes, since they perform much the same task of isolating the input from each joystick until the select pin is pulled high, but allow for a smaller, neater PCB. Both ports point up, because the SAM's joystick port is quite close to the Euroconnector, and most plugs would clash with any other peripherals attached there.
Available at MonsterJoysticks.com