Out of curiosity, how is the overall health of the ignition system? Last time the cap/rotor were changed? Brand?

It could be worth your time to test your spark quality, get a spark tester and determine if you have good, consistent spark.

I'll offer a dissenting opinion on the fuel accumulator. While it can cause a difficult time starting when warm/hot, the car SHOULD start if you crank long enough and the fuel pumps rebuild pressure. Once started, the accumulator shouldn't have any real bearing on the engine's operation, especially at idle. You shouldn't be running rough or missing out if the accumulator is bad.

I bring up spark because I went through a similar saga in my SL. Was a PAIN to restart hot/warm, and always seemed to have a really crappy/lopey idle when hot, sometimes getting to the point that it acted like multiple cylinders missing.

I did replace the accumulator (it was definitely bad) and it did help with the hot starts, however it did nothing about the poor running. Eventually one day the car simply failed to start. Testing showed no spark at all. EZL failed. Replaced the EZL with a junkyard pull and the difference in how the engine ran was night and day from how it had been behaving before. The rough/lopey idle when hot disappeared and has been gone ever since.