DarkCrisis
Let her cook.
Have you looked at the Cursed Scrolls for Shadowdark? They have hex crawls and I remember at least one dungeon with 20+ rooms. Labyrinth of the Minotaur or what is called that came with the free rules is also bigger. There are also good 3rd party ones for Shadowdark. Or I just run adventures from some other OSR game, most of them are easy to convert. Just use SD monsters instead, divide gold treasure by 10. Saving throws must be improvised based on circumstances, but that comes easy to me.
I think it would be easier to just use whatever adventures main system for xp (averaged out).
Like if playing a D&D 2E adventure just use the Fighters XP chart and monster HD for xp.
I put in work trying to convert one to Shadowdark and the money conversion to SD's xp system was just bewildering at times.
SDs only flaw is it's xp system which IMO doesn't make it very compatible with more normal xp system games.