freewheel for micro scooter wheels Answered

is it possible to make or source some kind of freewheel and sprocket device for a wheel of around 80 - 100mm diameter?

i've googled a bit and found micro folding bikes with similar sized wheels but i haven't found replacement parts listed for them, the closest thing i have found is parts for rockboard scooters but rear wheel assemblies cost $80 each which seems a bit steep...