yes to all three, but the third one is a bit tricky, i wouldn't rely on that. because you'll need all of workers, so you'll have to jack some things way up, and end up with problems later
the best way to do what your thinking, would be to use C3s to manhandle your work force into being what you want. you want to increase your EI? raid a C3, and before you do anything else, close the schools, wait a gm, then transfer out to get your teachers and professors. do the same with hospitals. once your get your ei at 150 or above, then start trading in HTS, lots and lots of HTS, and HLM, and HTE, and for good a WS, lots and lots of MLM. if you set your education priorities right, you can smooth it out nicely over time.
what your thinking, is that you way over educate, and use the high salary professionals to trade in for fresh llw. the thing i'd advise against that, don't turn this game into a job.
what you want in your country is HTS, HTX, EXE, HLM in your country making money, you really shouldn't make a strategy on trading them out. they are your countries economic back bone.