You're doing things just for the principle of it -- you perceived that you've been treated unfairly -- and now you want to make him pay for it.
There was never any requirement for you to give him half your paycheck nor is there any requirement for him to give you hald of his, I've never heard anything so absurd. With your earning potential, it's possible that YOU might wind up paying HIM spousal support, have you considered that?
You have the ability to have this done in a few weeks -- if you think that you're going to hammer out new financial terms in time for this divorce to take place at the same time? I'm thinking that you're sadly mistaken -- he can contest the divorce, seek spousal support from you, in general drag this out so that you incur more legal costs, etc.
While I realize that the competition for RN jobs is very real, you perhaps should have been doing something to secure employement in that field prior to graduation.
You're about to open a whole huge can of whoop a$$ here -- and I'm not certain that the outcome will be what you want. Cut your losses and simply move on -- and hopefully, your bitterness and animosity will eventually fade away. You're trying to punish your STBX for something that you were apparently on board with during the term of the marriage.
No one should be paying your way through life, especially when it's simply punitive. You have the ability to make a great living with your profession -- live your life as opposed to spending it mired in the past.