The only question I have now is, can I put multiple CFW on a single card? I've found a guide but it uses Linux programs and commands, I can't really follow on my PC. Probably gonna re-ask this on the support thread.
I'd imagine that'd be complicated, considering they use separate partitions. There probably isn't another solution other than the one you found. Btw, retroarch can be installed as switch homebrew.Android and Atmosphere. I wanted to have Android for RetroArch mostly, but also other Android apps I play. The guide I found goes over what to do, and I can do some of it, but don't understand it. I can't post links, but if you google kbz26gxib9cqlot you'll find my reddit post, which is apparently the only place I can find it linked. It was a dropbox of a text file called "build multicard switch.txt".