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at the accerlation and feedrates needed for printing (3000mm/sec^2 and 500 mm/sec, respective)
There is no "need" for 500 mm/s. In fact, I'm not aware of an extruder which can achieve such speeds just closely. The best ones I've heard of manage extrusion for about 280 mm/s head speed.
That said, printing at 20 mm/s or even slower will work just fine. I think you should approach the matter from the slow, reliable end of the spectrum and experiment with supersonic speeds like 500 mm/s later.
