The chest is no biggie but changing the disc is pretty darn disappointing. It was more than just a gameplay element but also an exciting visual element with its lit up inserts. Replacing it with an unlit map is sadly a pretty steep downgrade.
Here are some ideas for alternatives:
Make it a spinning LED disc. You could create wild holographic effects with it. When not spinning you see the map graphics, when it spins different animations are played.
Make it a literal liquid maelstrom. Some sealed blue fluid and some lights and you could have an impressive “analog” visual.