Yes. You can switch. Since it is the original rom, I think there will be no wifi or sim problem. But the data needs to be deleted, since when the bootloader is unlocked, the data is deleted anyway.
It may be related to the crash of the system ui plugin. Even if it doesn't appear. Try to re-install the rom or try these:
https://xiaomi.eu/community/threads/many-apps-are-crashing.74030/post-734482
https://xiaomi.eu/community/threads/hyperos-1-0-stable-release.71170/post-732722