The problem is that your plan hinges on a first step - getting the student visa - that may likely get refused. Therefore, not much of a plan.
I suggest you start by looking at the application package for spouses. Pay careful attention to what they require in terms of documentation of your relationship.
Again, if you want to apply for the student visa first, it's up to you. But it may be a waste of time and effort that could be applied to getting the outland PR application ready. (Note that most of the application package for outland is the same as what you'd need for inland, so preparing that won't be wasted time)
what a pain.. ok great advice