The roguelike bits are mainly client-side; there are people using Evennia to develop roguelikes (not sure if any are actually released, but it can be done).
Yep. So long as you separate concerns well it’s quite doable. The heavy lifting is deciding how to turn roguelike tiles into MUD rooms, or vice versa. There were some MUDs doing procedural content back in the ‘90s, and others that had a minimap, so there’s plenty of demonstrable overlap.
