Example: I have security sensitive US clients, and I'd be concerned that (in the future, let alone present) I'd be labeled a security risk for carrying a "chinese cellphone."
How do you mitigate this concern? (serious replies only please)
I think if you put a case on it, the make/model of your phone will be brought up exactly 0 times in life.
Small aside: I used a Oneplus X for more than 5 years, but these days I'm not sure what positives OP have over other manufacturers. Early phones were great value but the recent releases just seem like other flagships. And the Nord for my usage is just a Pixel 4a but worse.
edit: even if you flash the phone with open-source ROMs and firmware, the closed-nature of cellphones in general make it nigh impossible to know what hardware backdoors the manufacturers are forced to put in.
While I assume they have it manufactured in China like Apple and the rest of the world it seems, I hope their quality assurance is Europe based.
Honestly though, I will watch the answers here.