You have a lot of good advice to try here. Like others said only you know how dodgy this is. Someone here I thought used a pool noodle attached to his rear rack - to force people to pass with at least 3 ft. And it worked for him pretty well from what I remember. In upstate New York - I mostly cycle in NYC but I run and drive upstate - I always slow down well behind the cyclist when in a car. I’ve had cyclists wave me around them when they’re prepared for it and when they can see it is safe to do so. And I’ve seen plenty of cars take the opposite lane while slowing down for both cyclists and runners who have to ride or run in the street. There’s a real lack of shoulders as well and it looks very similar. That said I’ve had a close call while running by totally clueless drivers. No bright clothing will help as they’re typically on their phones. If you could ride with one of those air horns I think that would be the only way bc you need to get their attention.

Mostly it’s thoughtless and careless drivers that you have to be concerned with. And there are so many of them. It’s awful how threatening they are. And of course in NYC (and elsewhere) you have the jerks who willingly put your life at risk bc they are awful human beings. It is what it is and you can only do what you can. Good luck whatever you do!