Err... actually, Progress can be set to exactly reproduce Wrye Leveling. Just set all the advancement rates to zero, and copy in Wrye's settings for training cost, sessions per level, and skill increases per level advancement.
Someone tell me what those settings are? I can include a pre-configured "Progress (Wrye).ini" next version.
Edit: ProgressGSD would work pretty well with that, too. Low levels would be cheap, high ones expensive, rather than all the same cost.
Edit 2: I just realized Shikishima was also suggesting this. Too subtle, man.