I’ve got reservations about using 2 different dual progression classes in the same build. It smacks of metagaming your PC or NPC. As for the mind mage, yes, I do like it. Very powerful though.
If you don’t like the TN version and prefer the 10 version of the Athasian Cerebremancer, then you could just add advanced magic granting dragon magic or avangion magic from TN as an additional capstone to 10 level AC - it’s no big deal.
The twin wells feature from mind interacts badly with one of my salient feats. Obviously mind mage is a very powerful option. The other class features are not too powerful.
I’m looking forward to seeing your material.