Two pans, one should have been a Mayday and was treated as such fortunately.
Why? Because the engine had started rough running, seemed likely to stop, and I was at 300ft just after taking off. So I needed the local emergency services to know, and I needed everybody out of my way.
It worked too.
But in the scenario you outlined - 1500ft - so basically 2 minutes to get everything sorted out, no nearby traffic, and nobody in a position to help me. No, definitely a low priority. I'm not totally convinced I'd waste much time at that height trying to restart the engine either.
G