Not really a BA question - but BA FTers will know the answer!

In three weeks I will be arriving at PRG from DOH. HBO on a J tkt. Two hours later I am due to fly on to BRS on Easyjet.

Is it possible to make an airside transfer within the non Schengen terminal? Or do I have to go through passport control, security etc??

And any other tips for making the transition from Qatar business to the orange bus? :-)

Thanks in advance!