the next sniffy/jayyo contest should be video of 4a with a mighty flea. Binding would be optional, seeing how it’s unresponsive. It would be a sight to see! ;D
It can be done, just make sure the counterweight is a high-contrast color so you don’t confuse them.
It will be quite some time before I would dare to do that. However, it does have that classic 5A-friendly shape. I’d sooner do 5A with my Aoda Littles rather than my Mighty Flea, mostly because it is a lot easier to use.