I would need more detail to see your problem with cemu. Cemu has seen big changes / fixes in version 31. This will require, for example, to move your backups. But the switch to v31 does not block it. I advise you to do a cleanup to launch cemu.
rm -rf /userdata/system/configs/cemu
mv /userdata/saves/cemu /userdata/saves/cemu.old
Once the commands executed launch a game from ES.
If cemu is running, you can restore your backups :
mkdir -p /userdata/saves/cemu/drive_c/cemu
cp -a /userdata/saves/cemu.old/sys /userdata/saves/cemu/drive_c/cemu
cp -a /userdata/saves/cemu.old/usr /userdata/saves/cemu/drive_c/cemu
Normally you don’t have to do all of this. But if you still have a problem after that, you should provide me with your logs.
PS : Im on AMD+Vulkan on Cemu without any issue.