Sierra released an official MPC CD version of the game shortly after the normal diskette version. And I have to agree that EcoQuest really is an excellent little game! I would love to have seen a third one.
And I realise this is slightly off-topic, but I’m glad to see you mention Access Software’s Mean Streets. That, in my opinion, is one of the unsung greats of adventure games. It’s only because of the vastly inferior sequels that more people do not recognise it as such.