The interroll omniwheel is the cheapest set of 48mm omniwheels that you can buy here where I live. You pay 25 Eur + 5 Eur for shipping for a set of 10 (=5 wheels) in ebay whereas a single Lego compatible one costs upwards 40 euros with shipping (and I needed at least three).
The interroll company does not intend these to be driven, but they nicely provide CAD data, so I opened Fusion 360, and after a short work, I came up with this axle.
This first version needs still a bit of work, as the bush is still a bit too tight. Still, it fits, and I have a lot of torque transferred to wheels.
Post cured using a sonic bath immersed IPO at 30C, then blow dried the excess. Some final sanding.
Fusion 360 was used for alignment cutting.