I'm glad to see you found your way to the forums.
LurchBrick has mentioned an attempt, but he may have given up on it as I think he was finding it easier to write a new engine that take out MFCs. Other folks pop in from time to time with the desire to make DC platform independent, but I'm guessing that after they discover how hard it is, or more precisely how hard they think it will be (whether or not it's true) they move on to another program.
Officially, there is no current support for this kind of move. Our focus is getting version 1.0 out the door. And I'll be the first to admit that we're having a heck of a time getting that done and I realize that we might have more of a chance if MFCs weren't involved, but the task is so large, it seems completely unreasonable to put my meager resouces into that. Like I said, taht is the official stance.
Personally, I think it would be great to port this thing to Linux (I don't know enough about MorphOS to comment on it). I'll help where I can, but most of the coding is why beyond my ability, so I'm mostly a playtester.
And as for wondering if this topic has already come up, it has.
But, I think it is definitely worth talking about again. In fact the more we talk about it, the more likely it is to happen. And, if it does happen, I'm ready to manage the new DC project (start up a new project on SourceForge, or fork our current project).
In fact I would go so far as to say if we can get enough interest, i.e. I think we might be able to port DC to linux (or hopefully platform-independent), I can start advertising for coders to help out.