Yes, I have a Stunt Cycle. Stunt Cycle has a ROM I believe, but it has no CPU. The 1975-78 era saw quite a few games that did use roms, but did not use CPUs. These games are very difficult to emulate because you have to build the ENTIRE BOARD in software, and it all has to be correct. You have to emulate each circuit, each component, EVERYTHING.
Microprocessor games are cake to emulate, because the processor is running a program, one command after the next. A non microprocessor game has no commands at all.
Of course it is certainly possible to emulate these games, it is just more difficult, and made doubly so by the fact that few coders have much practice at such a project.
A good programmer with access to a machine and the rom data should be able to make a very good clone without too much trouble.
Now, next issue. Candy Cabs in Australia. They are much cheaper in Au. You are so much closer to the source. Some Au game companies in import the suckers just for the monitors and then throw the cabs away.
Ok, yes I have Stunt Cycle, and I have 2 different Pongs. Want to make a deal? North American van lines can ship 2 games for around $300 total.