Don't bother trying to change a Checker's mind. Just agree. But given the choice, with an engine fire (with no apparent loss of thrust), I'd wizz up to 1,500' AGL (or whatever S/E Accel is), clean up and get to Vfs + 20 and then run the memory items (all three of them). In our case, we've been told by the manufacturer that the engine can burn for 20 minutes without compromising the integrity of the airframe. Mmmm! I'll just push it for 10-20 seconds or so.
However, given a fire with seizure, high vibration or loss of thrust then I'd start proceedings once I'd got the thing flying nicely when above 400' AGL. But not rushing is the key. And as some of my colleagues have said in the past, "Enjoy your engine failures."
PM