Well, it’s not about winning, modeling is not a contest to me. I was suggesting a technique to add detail and realism. You claim it’s not possible. And furthermore you want to limit my attempt to using your construction methods.
So let me say this, any criticism I offer is always constructive criticism and not meant to offend anyone.
That said, when I scratch build, nothing is off limits as far as materials and technique. I would consider many approaches. One, build it out of wood and carve from one piece, giving it more structural integrity. Two start with hub and drill holes and add wire, giving it more strength, then glue the handle to the wire. Possibly even use small shielded wire for the handle. Many possibilities and approaches!
The glue added with a needle would be small enough. I think you hurt your chances by making the wheel 4mm instead of 6mm. You could also exaggerate the angle between the spokes to give yourself more room for a longer handle. So many ways to skin a cat!
In closing, I applaud your efforts and what you have is certainly acceptable. However I guarantee you a 6mm wheel could have the bumps added. And the material you add the glue to will not affect the ability to do so whatsoever and you don’t have to sand anything to add bumps either, so fragility does not come into play either.
So just get some magnifying glasses, PVA and a needle! You can do it!

If nothing else, I hope I shared a technique to be used in the future! Cheers mate!