I know that many people love the minute detail that the full spectrum of RM2 professions provided. The professions were basically a package of individual skill and base lists.
Keeping the base lists within professionless and level-less RM is easy.
The individual skill costs are completely compatible with level-less but I am open to ideas about how to create that flexibility with professionless gaming.
BriH has pitched the idea of getting rid of skill costs all together so that every skill costs 5DP (I could be wrong about who came up with that idea but that is not the point). I was thinking of playing with the idea of going to the other way.