Did you fall while on the job? Why would they want/need to observe this especially in light of what happened to you?

Do you have a permanent catheter in your abdomen or do you self-cath every time you have to pee?

I supposed if the latter is the case you could empty before you go and try to rig up a large syringe to the catheter and inject the warmed up pee.

Are you worried about the mechanics of pulling this off or the possible health risks of having reconstituted urine in your bladder for an hour or so?