For the solar patches specifically it isn't even an emulator issue due to flashcarts. I have one such flashcart fix in there myself. Funny... I thought Boktai 3's translation was on the site but I can't find it. Anyway, that also had a solar patch in the optional stuff.
Most GBA-only flashcarts either aren't being made anymore or aren't being worked on anymore, so fixes are needed. However since the solar patches are floating around on Git I see no reason to rush without asking permission or whatever.
EDIT: I actually can't confirm such an emulator rule, can anyone point me to that? I only see the rule about hacks that work on single emulators, not things that enable playing a game on all emulators.