4AD is a very fun system - I need to get back to that. I'm in a couple of facebook groups that the creator is in so it's been fun getting to briefly chat with him. I'm currently running both Ironsworn: Starforged and 2d6 Dungeon for my main solo games, but I have a post that I'm currently drafting for a one-shot in a new system since I really need to play through some of the million games I have collected through kickstarters and bundles lol.
Oh, for your Spelljammer OSE - if you don't already have them collected, Internet Archive has (or had?) some of the old Spelljammer pdfs available that you can snag from them. Worth checking for a free and mostly-legal means of snagging those.