Do you have to set up newspaper on the floor beforehand?
Cut the front wheels off of the wheelchair and use rigid metal electrical conduit for the handles. You can wrap the ends of the handles with gaffer tape or get a pair of bicycle handle grips.
Is this going to be used like an actual rickshaw or for something else?
Is there one specific thing/scene that they object to? If so, is it possible to re-write a bit to make it more palatable?