just some playing with smudge and brush tool, not sure how it looks..

Very good idea, but front wheel is too big. Make it little smaller or make bigger a wheel arch (sry for poor eng )

You could try out the reduce noise tool/filter. Apply with care.

I think wheels are good, let's imagine it's on bags so it's rideable.
Brian, I don't want to mess with that thing haha
Here's small progress I did for tonight, bed time now