Unlocking bootloader on a Cn phone

Hello, I have a Xiaomi Mi 8 SE with currently now the chinese ROM 12.5 MIUI. It's very annoying to me because I live in Europe and it's a pain not having google apps on my phone. I want to change my ROM but I can't it says "The place where the account is registered does not match the place where the phone is sold".

So I have a couple of questions:

To unlock the bootloader I only need to buy an account?

Should I use Pixel Experience or the global unofficial rom? I would lose any feature...

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