I fully understand your request. But creating configurable push messages in a user friendly way is not easy in Homey, and I am struggling with how to do that.
What I do myself is send a whatsapp message to myself and my wife when a cheap hour starts. Also Homey then says: ‘It is now a good time to start the washing machine @ xx euro/kWh’
Secondly, I send a whatsapp message to myself whenever Homey receives new tariffs. I created a flowcard especially for that. It will give you all tariffs for the day, startting at 0hrs. It is not very user friendly, but at least I can see all tariffs of the day by opening the message.