Dunno, It might work because I managed to mincost/maxskill my maribel. I just hope reducing it's cost while it isn't CC'd won't come and bite me back. Because I've only reduced the UP cost of my units in their CC'd form so far. I don't know if its okay or not.
So supposedly my Maribel will only cost me 20 UP once she's awakened because I brought her cost down to 16 while she's in base form.