You must've joined the wrong channel. You need to join the Miatoll updates channel. There you will find a huge amount of roms that you can try... including MIUI 12.5 ports. But while they're cool to try... I've yet to find a proper daily driver. They're buggy and couldn't find one rom that could pass properly safety net... so half of my banking apps wouldn't work. Long story short...no.... they're not stable...and you can't dirty flash. But give it a go.... you might find something you like.