Faolyn
(she/her)
Then you simple divorce Spelljammer from the old settings. Reference Torilspace, Greyspace, Krynnspace, and... Ebberspace(?), but don't flesh them out; just sidebar 'em. Then what I would do is:We should remember a thing. The crystal spheres of the most famous settings can't before the setting themself.
Include a series of Random Planet Tables and Random Solar System Tables.
Then, have a series of Random Planet Inhabitant Tables, with the idea that--like with most SF settings--each planet would only have a small number of sentient species. One table for races, another for tech level.
Then, just focus on major locations in space, like the Rock of Bral.