Instana U

We are setting up an EUM webconfig in K3 for an IIS Site. the concern i have is that the JS script assum only https aka 443 port for the EUM users reporting port.
in instana classic it's port 446 and K8 used another port however, in our case the INSTANA webserver respond on 443 for request on 
https://instana.domain.com/eum/min.eum.js
this means that I need to open for anyone on port 443 when running on K3 installations. (i don't want that)
is there a way to change the port to ,lets say 446 for the reporting clients (EUM part)?
otherwise anyone have access to the admin login page as well.. The customer won't allow that.

Just FYI.
K3 (standard edition) only support port 443 for incoming request for client EUM script.
so if anyone need another port , just put an proxy in between and manually add the port you wish in the EUM script..