Dispenser and jukebox

The dispenser needs to interact with the jukebox to insert discs into it.

Yes, this already exists on the Bedrock version, Java and Bedrock versions should be different, but on the Bedrock version, the hopper picks up the music disc from the jukebox immediately after the music ends. 
Let there be a difference between the versions that the hopper will always take the disk on Java, so you will need to come up with a clever mechanism to create an automatic jukbox.

I consider this a minor but necessary feature for both versions of the game!