That is not alias.
Keep that in mind. It will change the entity ID which is used in automations and such.
Yes sorry, after I typed it I realised it was literally changing the name of the entity. I’d seen that whilst editing dashboard before.
All changed, and tested.
Just to update all who helped, this is working perfectly.
Next stop, how to create a button that sets a volume control and a sleep timer on a Denon amp. I’ll create a new post.