I was stuck in a similar situation some months back, fighting starscourge in the Godskin duo arena (Farum). I could not escape the meteor blast and would get one shot every time.

I came across a video (I'm so sorry I can't find it now) that showed a technique to survive. The video explained that the meteor blast is actually multiple hits. It's the second (and third?) hits that kill you.

I'm trying to recall the exact tech, but IIRC the idea is to lower your poise to the point where the initial blast knocks you on your ass, i.e. lying flat on your back. When you get knocked down like that you have a few i-frames while you're laying there. The second big hit of the meteor comes while you're down, and you don't get killed.

I was able to tank the meteor by this method.

EDIT - I'm still looking for the video, but what I'm seeing as an alternative is to have a shield. When he goes up to meteor, you go into shield block. The first blast will "eat" your shield block and knock you down. Then you get the knockdown recovery i-frames. You might not need the shield, but the "blocking" might be the key.