I noticed that at roguelikelike.com (which is hosted by you, @flend ?) unBrogue and gBrogue are available for play. Cool!
Here's some other possibilities, all are based on 1.7.4 i think:
BrogueRoles - lets you pick a sort of "character class" before you enter the dungeon. For instance, if you choose Barbarian, no staves will appear in your game, instead other items will. https://github.com/tsadok/brogue/compare/roles https://libredd.it/r/brogueforum/comments/5azesv/brogue_roles_a_way_to_choose_an_overall_build/ I'd probably be willing to rebase this onto 1.9.3 if you like.
Sulai's Brogue - I'm not sure what to call this fork, but it has many interesting features that aren't merged into its main branch, instead each feature is on a separate branch. On this branch, the death of an empowered ally results in your empowerment wand(s) being recharged. https://github.com/sulai/Brogue/tree/feature/recharge_empowerment_on_ally_dead If you like, I'd be willing to combine any branches that look interesting, into one grand fork. It looks a little too complex to rebase onto 1.9.3
Broguer - there's not a lot here except some convenience / QoL stuff. https://github.com/yrmvgh/BrogueR