Lapistia

No, I need a lot of Willpower.

Through Ishhegal, you can have Ishanadi magic, 22 Willpower, and 5 Magic. Just take an Aristocrat, Ishanadi, Energy, Creation (Wisdom, of course), and Rosario. Subjugation and slaves are in place, Willpower is good, Magic is high, and the spell selection is decent.

Added after 38 minutes
In fact, Willpower will be even higher than what you would have with a Supermind. You'll also know more spells, although the choice will be limited. Magic will be the same, as will the number of slaves. And the energy reserve seems to be more substantial. In general, if the character is weaker, it won't be by much.

Added after 21 minutes
Although the old character would certainly be faster and tougher than the current one. But, in my opinion, there wouldn't be much diversity in the specific spells. Of course, I'm assuming you're taking:
1) Wisdom
2) Mana Shield
3) Slipstream
4) Taoist version of Negation
5) Aura from Metamagic
6) Corpse Absorption from Metamagic
The character will undoubtedly be significantly faster (7 vs. 2), slightly more resilient, and probably with more energy, despite the lower maximum. However, after all this, he will only have 3 spells to choose from.