There's almost no risk, you can install it from the browser, the bootloader gets relocked so no issues with banking apps and rooted device, and you can still have play services on the phone but without it being able to access the whole storage and device info. You seem to literally just be spewing words without knowing anything about the subject.
If you don't want it I'd be willing to take it and experiment myself with graphene OS.
Because there is practically no risk of damaging the device and bricking it. If you knew anything about the the distribution, it's inhalation and android you'd know that the risk is almost nonexistent and reversible. I understand you don't want to run any risk, sure, it's a valid reason, but to damage the device is practically impossible just from installing another android variant.