The Atari 7800+ is a trip down the retro rabbit hole

Technically, no. The Atari VCS (2021) would play some 7800 titles, and the original Atari Flashback even looked like a 7800

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Both suffered from the same lack of available or included 7800 titles.

But maybe the Harmony Cartridge works with the 7800+?

Not just for the techies, it’s really simple to set up a RasPi Zero (or any old RasPi actually), and you can user any USB or BT controllers already own.

There are excellent HowTos available (like this one for RetroPie, alternatives to RetroPi exist, IRRC RecalBox is also very popular).

But if that is too much: About 10 years ago I obtained a download for a 32GB flash card image for $5 off ebay, with the emulator preinstalled and all games for all consoles that were released until 2000 or so.

All I had to do was flash the SD card and pop it into the RaspPi. That value for money was hard to beat, even though the overwhelming majority of games that I wasn’t already aware of and tried on a whim were utter shite.