Thank you for this Jonatan, to the original OP I stand corrected. I did test what was posted in https://community.cisco.com/t5/network-access-control/cisco-login-radius-and-local/td-p/2989344on a Cisco C3560G switch and it worked, will test more on 2...

I'm sorry the short answer for this is that... your requirement is not possible. You can't login as local if the RADIUS server IP can be pinged or active.