Trigger that includes all interactions. Slash commands, dropdowns, buttons, etc. Would just provide the raw JSON. Maybe enable in Advanced Mode only. Could have a checkbox for “Fallback” to only trigger the flow if it’s unhandled by other flows. Useful for custom error messages, unsupported interaction types, master/slave bots (would make FBI very happy lol), etc.
Perhaps this could also be accompanied by a Register/Unregister Slash Command block that just registers a new slash command (maybe context menus too). It wouldn’t need to be server-specific or anything, it would just add it to the normal command list.