I'm just going to add, OP: Since you need to A9LH or reinstall menuhax, you'll be doing that with a new emunand or sysnand. Please do not forget to use something like JK's Save Manager (https://gbatemp.net/threads/release-jks-savemanager-homebrew-cia-save-manager.413143/). Grab your saves so you don't lose them.
I'm being dumb. Wouldn't OP regain full support if he updated ReiNAND to nightlies? It seems they added 11.4 support. Alternatively, can't OP also just switch to Luma (that has 11.4 support) to regain play-ability? (not trying to get OP to switch, just using what supports the firmware) They are still running the "CFW" from a 9.2 environment. Wait, are there ReiNAND nightlies?
I'm being dumb. Wouldn't OP regain full support if he updated ReiNAND to nightlies? It seems they added 11.4 support. Alternatively, can't OP also just switch to Luma (that has 11.4 support) to regain play-ability? (not trying to get OP to switch, just using what supports the firmware) They are still running the "CFW" from a 9.2 environment. Wait, are there ReiNAND nightlies?