there's no guidance in the lost com procedures for the scenario you present---nor for en route diversions due to wx etc under part 91
but no law [even something as set in stone as the lost coms procedure] would ever force the pilot to endanger the aircraft in other words if you must break the 'law' you must to prevent disaster the law in the absence of 'law' is to do what you have to do to ensure a safe flight there is no guidance---also atc may expect [and hope] for such a move if you've lost com and the and there's a weather diversion common sense and judgement are the law now.
most likely in the US you'd be in radar contact so they would get every one out of your way and they'd probably obtain knowledge of what your most likely diversion would be---sometimes life just sucks.