SP Resets

You could place a new 4th job sp in 3rd job (where you want it to be), then use 4th job sp reset to pull a point out of 3rd job (where you don't want it to be) and apply it to 4th job where you want.

But you would have to seriously grind hard for 90 days to get significant value out of this (or have a bunch of saved sp).

Unfortunately, I bought it today and tested it. When you use it, you can see your whole skill book, starting from 1st job all the way to 4th. However, the only place you can pull out skill points (which has the orange down button) is in the 4th job category. So, to test this, I pulled out a point, and to my surprise, the 1st, 2nd, and 3rd job columns all disappeared!

So, the only thing 4th job resets work on are 4th job skills. It is impossible to do what you mentioned, sadly, or I'd do it. =(