Create F5 LTM Content for http / https via port 8080

The first and most important thing is that you shouldn't try to do SSL and non-SSL with the same IP/port combination. You also wouldn't be able to create two VIPs with the same IP and port.

On the second part, if I understand you correctly, you have a wildcard port VIP (ex. 1.1.1.1:0) so that you can accept port 80, 8080, and 443. The iRule for that might look like this:

when CLIENT_ACCEPTED {
    switch [TCP::local_port] {
        80 {
            pool my_80_pool
            SSL::disable clientside
        }
        8080 {
            pool my_8080_pool
            SSL::disable clientside
        }
        443 {
            pool my_443_pool
        }
        default {
            reject
        }
    }
}

Apply a client SSL profile to the VIP. It will be disabled if the client request port 80 or 8080, and any request on an undefined port will be rejected.