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OK maybe this is a dumb question but if I have a camera with a 600 f/4 lens and I put a 1.4x TC on it for a 840mm f/5.6 lens won't that be a very similar FOV? And I can use my existing camera? And I can take 1,000 photos align and stack them in software? How much better would this $45k system be than that?

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Depends on the lens. Lenses made for general photography often don't stack up against a good triplet astrograph when it comes to things like chromatic aberration, field flatness, sharpness etc. You will also need a good tracking mount and some form of guiding (e.g. dedicated guide scope + guide camera). That said, you can do much better than Hyperia with much less money.

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