With Xbox and Playstation making next gen consoles, I guess its only reasonable that Nintendos thinking of doing the same thing. I wonder if it would be something as innovative as the ds or just a switch 2.
FOUND ONE ON ANDROID! Theres this app on the play store called "File Converter" by Ice Cold Apps. It may not be as efficient as a program on computer, but it does the job. Hope this helps :)
Most likely, he is using an r4. So yeah, I suggest the same thing you said and if it doesnt work, you probably should just get the actual cart or play on an emulator.
Hey, I know I'm late to the party, but I'm investigating a way to do this using a raspberry pi. I believe a program called RaspAp can make an open hotspot on pi. I have yet to do more testing. Heres a link to a video on how to download it.