Number 2 is the ticket, but honestly, I doubt you need to purge the headspace. It's still going to be generating a little bit of CO2 and that will lay like a protective layer on the top of your beer. Won't hurt to purge; but not really necessary IMHO.
"All right, brain, I don't like you and you don't like me - so let's just do this and I'll get back to killing you with beer."
- Homer Simpson
2013 spring IPA
White Christmas ale
Holiday Porter, Grilled Pumpkin Ale