I worked for VW back when they introduced the Super Beetle with Macpherson struts. Brand new they had trouble with the vibration that mimicked wheel balance issues on every new vehicle and not cured by "just" balancing tires. In that era all OEM tires on VW's were Continentals.
Unfortunately my memory isn't serving me well but the balancer we used with success was designed for "on car" balancing routine. Manufacturer will appear in my memory likely next week, but it will appear!
We could spin the "wheel assembly" up to over 100 mph and we would attach a human hair to the fender as the telltale. Essentially you balanced all the spinning components using this method and we made an index mark showing position of wheel relative to brake drum.
Worked just fine in this application and quite possibly would be successful in the "tough to balance" scenarios.
It was a Hunter, just wasn't sure. I notice Alemite made a very comparable machine, same era. Here's the entire setup. Likely OSHA outlawed this!
Hunter Wheel Spinner Balancer with Adapters Portable RARE Works Great | eBay