Cook the pasta according to the package. Drain and rinse with cold water, reserving 1/2 cup of the pasta water for later.
Add the bacon to a large, cold skillet. Turn the heat to medium high and let the bacon cook for 5 minutes. Flip the bacon and cook for 2-3 min or until the bacon is crispy. Drain all but one tablespoon fat from the skillet. You may have to do this step in batches if you can't fit all 8 slices in the skillet.
Turn the heat down to medium. Melt butter in the skillet. Add the garlic and shallots and cook for 2 minutes, stirring frequently so the garlic does not burn.
Deglaze the skillet with the white wine and scrape any remaining bacon bits off the bottom of the skillets. Let the garlic and shallots simmer in the wine for 2 minutes. Add the kale and cook until just wilted, 2-3 minutes.
Add the pasta, 1/2 cup pasta water, lemon juice, feta and crumbled bacon to the skillet. Cook for 1-2 minutes, stirring, until the pasta is warm and all the ingredients are mixed together. Season with salt and pepper, to taste. Garnish with more feta cheese, if desired and serve immediately.