I made a prototype of the Trump Card a long while ago, but got rid of it.
Now, all the components are easily available and PCB fabs can make your own PCBs for a small price.

I made the schematic in KiCAD and the PCB is under way presently. There's not much components so I should finish within a month.

Meanwhile, you can modify the schematics to make a full retro computing version or a fancier version with many more features.