Can I clone / program a new key?

[Gavistation]

Hi everyone, 

 

Hoping for some advice,  I have a 2008 Subaru impreza (gen3) which has push button start and no physical ignition barrel to take a metal key. All programing instructions I can find online to reprogram (add another one as I only have one which is risky)  require turning the ignition on/off with a key in quick succession. I tried with just pushing the button instead of the key method but I couldn't seem to get it into key learning mode. 

 

Does anyone know if this can be done myself or does it strictly require a programming tool? 

 

There is no key ignition behind the blanking plug

Thanks!