assigning a new 2090 port ... (how to)

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Hello ,

I wish to assign another port for my clients domains , for example
port 2090 .

domain.com:2090

when the client type domain.com:2090 cpanel should
return for example /frontend_tech/index.html


In the /frontend_tech/index.html I want put a web form to provide technical support .

/frontend_tech/index.html should be password protected in the same way of /frontend/ directory which contains cpanel themes .


Is it realizable ?