As long as you verify the model of OnePlus you use works in your country, you could give them a try with lineage OS. My OnePlus 5T ran it great. However, in Canada Rogers just recently nerfed their Network so that my 5T no longer worked – 4g, LTE or 5g required now, and voLTE on Rogers apparently wasn’t compatible with OnePlus models. I’m trying to work up the courage to install graphene OS on my new pixel 9.