Renumbering is no problem, I not yet used it in important situations.
Ok, altering it, how about this:
you are either good or not-good at something:
1. Closed personality vs 2. open personality
1 good at shielding themselves but not good at dream alteration
2. good at dream alteration but not good at shielding themselves
If you are good at something: class skill
If you are bad at something: cross class skill
No modifiers are counted.
I could easily combine this with you skill point idea's.
They went level up last session so I need to balance this quickly.
This quest is intended to end at level 20, the players are currently level 5.
So, yet to be determined:
- max skill points
- dc's
A commoner can't alter his own dreams, unless he rolls very high. So to speak.

So a dc should also be high.
Dc minor - 10 example: growing a flower or waking up
Dc small - 15 example: growing a tree or resisting a NPC dc 15
Dc medium - 20 example: changing a forest from one type of trees to another type or resisting a NPC dc 20
Dc large - 30 example: growing a forest or resisting a NPC dc 30
Dc great - 40 example: creating a own dream pocket plane (a very loooooooong proces) or resisting a NPC dc 50
So in the end, a player of level 20 has a 20 bonus. If he wants to create his own pocket plain he will need to take 20. Resulting in a total of 40.
The maximum of skill points is the characters current level.