1. You will need lazy flasher for keeping twrp as recovery, even after booting, as miui removes twrp after booting. But there's a much simpler option, boot into twrp as normal via ADB, root, boot into system, install official twrp app from play st...
Also, now it's seems impossible to uninstall system apps!! Using 8.11.23 miui eu
Does stock camera and ir face unlock works?