Ok after an absolutely stupid amount of time spent at my desk tinkering with the switch and switching files around I finally got GBA to emulate on the switch (tested Donkey Kong Country) runs great. Now to see if Dreamcast will emulate nicely.
Discussion
I broke everything and I'll restart tomorrow... GN 💤
So Dreamcast emulation seems to only work with some games but it does work, better than nothing but not ideal.