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Exactly, this won't be worth looking into before we have interstellar travel, and that is probably a very very long time away
Actually, it might be worth doing this first. Once you've got even a partial Dyson swarm you've got ample energy to make interstellar travel a lot easier. You could either use beamed propulsion (lightsails or magsails), or manufacture bulk antimatter to fuel high-efficiency rocketry, or a combination of the two.
But you can't do this to earth's sun without causing catastrophic changes on earth, so you have to reach a different star before doing this. Blocking out even like 1% of the sun's energy from reaching earth would likely wreak havoc on the earth
We'll just keep a window open on that side of the Dyson sphere.