PSD2 client cert check and passthrough Subject DN

I have been asked to implement a client cert check with external CA's and if the check passes then pass through the client cert Subject DN to the backend application for checking and action by application.

I am an F5 newbie but from my reading I don't want to have to create a certificate bundle on the device as it will need updated as the CA's change.

Any help about how this can be done quickly would be appreciated. I have a pentest scheduled and I want to do a cert check fail and pass

Thanks

Richard