Except under the FairTax I have no W-2s or 1099s to get my totals from (I have to do that myself.)
If you are capable of performing the accounting gymnastics you outline, then the income tax well within your grasp, and the FairTax will be just as much accounting work (probably more, since there is no summary accounting.
Try some Pepto Bismol ... that might help the sickness ;-)
Meanwhile, you just described having to go with a handful of forms on top of end-of-year summary statements to even remotely figure out what your taxable income is, let alone how much you actually wind up paying in net taxes.
The Fairtax way is simpler and far more intuitive.