Read this article https://hackinformer.com/2022/05/25/hardware-review-krzysiocarts-flashcarts-for-nes-famicom/
I’m glad to see not only these are still being made but improvements were also being made (the ability to save progress in Kirby, Zelda, etc) and there is an NES version.
I bought one of the first ones made years ago, it no longer works unfortunately, but while it did it, it was pretty fun to use with my Retro USB AVS. And while no ED, tons of games work including hacks and homebrews.
I’ll see if I can pick another one.
I say even if you have an ED get one of these, you will be supporting a developer.
Link to the creator’s website http://krzysiobal.com/