"Dyson spheres, in it's original concept, weren't solid shells, but flexible arrangements of satellites.
Which we could do today if we find enough resources, we just have no way yet to use that energy.
Nuclear fusion happens mistly in the stars core, the suns surface, for example, is roughly 6k degrees hot, so if you can build a scoop long enough, say, 100m, and attach it to a smeg going fast enough to avoid being pulled in, or just ignore gravity like TN ships do, it should be reasonably possible to mine potential fuel from stars.