Can I use Klarna to pay for flights with a VPN?

I currently live in Australia on working holiday and plan to return home to the UK soon. I have a klarna account, UK billing address and UK bank account/debit card. Is it possible for me to use a VPN and switch to UK to use klarna on some sites and airlines that allow that as an option?

And does anyone know of any airlines or sites that allow klarna at checkout? Preferably sites that don't bump up the prices for instalment pay.