@Ricmar I did successfully reflash my IMEI after I accidentally wiped them out doing various test reformatting and installs. Here is the official post on how to change your IMEI.
But you will need to first flash LunarOS, I have a link for a LunarOS download here.
I then used SP Flash Tools following these steps, which is basically what @plamen has in the Official guide for manually updating your phone
Then you can use SN Writer IN WINDOWS to change your IMEIs, then finally you can re-flash iodéOS (you can use the same SP Flash Tools guide I list above).
Good luck, we will be interested to see if you succeed, it is certainly a “gray area” to flash IMEIs to get around a carrier device whitelist, others will be watching your progress closely I suspect.