I don't think that your cops should be focused on proactively enforcing this kind of stuff at all, as you seem to agree it's a fools errand that sort of begs for problematic interactions. The energy should be going toward making safety culture and education ubiquitous. If you look at crash and injury stats for your jurisdiction by vehicle type it should be readily obvious where any or all of your proactive enforcement efforts should be directed. State laws about electric bike / electric motorcycles are messy because they're pushing through a car culture, on car infrastructure, against car lobbies and so I can understand why the kneejerk response is to frustratingly try and integrate all of these fiddly classifications into enforcement directives, but I think that's a misdirection. If it looks like a bike, focus on education. Don't be having your squad cars pull over bicycles, motor or otherwise, that's just absurd. Maybe in the future some of these classification will just be considered motorcycles, and that will be much cleaner. But the mess in the meantime is mostly artificial.