Jupyterhub multiple web applications port problem

Question

at my firm we have a jupyterhub/lab installed and is used by roughly 70-100 people in a secure network that can only be accessed to from work. Recently the idea of hosting web-applications for short time use came up, but we are having port problems. User A is running a web application on port 5000, and User B can’t use the port because it is already in use. Port 5000 is default, it can be changed but this is not the behavior we want. Does anyone know of a way for web-applications to run on the same port in the same environment? Have looked into server-proxy but i do not really understand it. Is the way to achieve this really to be running a vm for each user securing that the port is not in use?

Any help is appreciated