SSH proxy one username multiple public keys

Hi All,

I have created SSH proxy, which works without issues with username and public key. Now he want to use one username for multiple users, who will be distinguished by public key, but problem is, that F5 ssh proxy send their own pub. key, is there any possibility to make exception for one username by irule ? Or do you have any idea how to solve it, if I do not want to publish it without ssh proxy ?

Thank you