Is there a roadmap anywhere for how best to migrate fields created using a module -- in this case, the Side Content module -- to CCK fields?

Failing that, does anyone have any suggestions about how I could approac it?

I have several sites that use the Side Content module, and I'd like to find a way to migrate them to D6. The yeoman Side Content module hasn't been ported to D6 -- CCK Blocks seems to make it redundant, at least for new sites, so I'm not expecting it to get migrated. As CCK gets more capable and takes over tasks formerly performed by other modules, this kind of question must come up -- any thoughts?