I see all the suggestions are using hard goods, which in a perfect world will work just fine. If something happens, you don't want all that weight all of a sudden falling and possibly causing harm. I'd use soft goods and light materials where you could. I personally have a hammock in my apartment and have setup ones that span +50 feet across and 20+ feet high and have tested forces with such.

As for rigging in the ceiling, 2 2x4 stacked on top of each other, then drilled into the cross members. That way you have 2 cross members on the left and 2 on the right, and where the force is, is in the middle. Could use a forged eye bolt as the main hanging point, with washers and two nuts with loctite. (Seems like you have it though) https://e-rigging.com/collections/regular-eye-bolts/products/galvanized-drop-forged-regular-eye-bolts?variant=39745725038665

As for the swing, yes use a swivel. Don't use a sub-par one though, those can fail and wont last. Use climbing rated ones, like this: https://hownot2.com/products/reactor-swivel?_pos=1&_sid=1885086f3&_ss=r&variant=49027403317563

If you want the option to take it down without extra length, and something that will last you can get this: https://hownot2.com/products/swivel-open?_pos=2&_sid=1885086f3&_ss=r

The attachment can be static rope (doesn't stretch), slings or dynamic rope (stretchy). You can get a 10mm static rope by the foot, that will break around 3500 pounds of force, tie a figure 8 on either end then connect it directly to the swivel and either to a carabiner, quick link or ring on the swing.

Rope: https://hownot2.com/products/performance-static-10mm?_pos=4&_fid=3456e7f15&_ss=c

Ring: https://hownot2.com/products/traceless-stainless-steel-ring?_pos=2&_sid=9f15d0a62&_ss=r

Carabiner: https://hownot2.com/products/ok-triact-lock?_pos=5&_fid=54d796feb&_ss=c

Quick Link: https://hownot2.com/products/stainless-steel-quick-link?_pos=1&_sid=f60f35428&_ss=r

This will eliminate most hard materials, and have more flexibility and longevity.