Do it like china does with iphones. Apple sells them but icloud in china is controlled fully by a chinese company owned and operated by chinese citizens.
While this does not fully prevent backdoors and hacking it does raise the bar quite a lot.
I still use my 2015 macbook air (purchased in 2015) as a secondary computer. I installed linux on it last year as it was not getting software updates anymore.
Other than one of the USB ports being a bit flaky it works perfectly fine.