There a tutorial on the 3DS forum of how to do a Sega CD injection using a picodrive forwarder as a base. @Sakitoshi post a guide on how to do it a few years ago.Hi there, i'been using the Injector and i was thinking if there's a chance to inject Sega CD games through Picodrive
https://gbatemp.net/threads/release-ultimate-gen-md-forwarder-maker-for-3ds.454972/page-10