I think you should get MIUI Europe, some problems talking with the support, and they told me that Xiaomi 12t pro has eSim, so you should speak with your seller.
You can find the list of countries that support eSIM:
https://www.mi.com/global/support/esim?lang=en-001&tag=xiaomi-12t-pro.
Now you can see on the website that:
"Dual SIM (nano SIM + eSIM and nano SIM + nano SIM)*Use of eSIM requires a wireless service plan. This service plan may be subject to certain restrictions of use on switching service providers and roaming (even after contract expiration). eSIM availability may vary depending on country/region and carrier (
https://www.mi.com/global/support/esim). For more details, please contact your carrier for more information. "
I believe that eSIM will be in any device, but because China is not supporting eSIM, they chose two nano SIM.
I need to check with the Europe ROM need to wait seven days to unlock the bootloader.