Ye gods, don't use UA's spell point system. It's almost as broken as the psionics system, only with more MP and without needing to augment. Instead, a better option, even as an idea, would be DnD wikia's spell point system. Instead of giving you more MP per level... it instead reduces the costs! That could at least be worked into a talent for the major paths.

I agree that freeform magic systems are too much of a hassle in DnD at least, but you could add a linkie or two for people to make their own spells. Having some basis on what's possible and what's not will help people homebrew more on this class.