This is mostly a matter of curiosity. I’ve recently started using Citra to play Fire Emblem with my significant other since I’ve found it more convenient than sharing a 3DS, and I’ve done the reading to understand why Spotpass content currently isn’t available on the system.
That said, I’ve also read that you can get Spotpass content onto a 3DS and then transfer the extdata to Citra to play it. Would it be possible, then, to get Spotpass content onto a 3DS game, pull the extdata, and then dig into it to discern what constitutes that content such that a tool could be built to inject that data into Citra?
I’m not a software engineer so I’m sure I’m miles off as far as technical feasibility, but it’s just something I’ve been wondering about.