I know you said not entities but this will do it whilst keeping last_updated & name, I did this but I have completely changed my UI and its in pieces atm.
last_changed isn’t an attribute it is a property of the state object. Check the developer tool / states menu, you won’t see last_changed in the attributes column. Petro explains it here:
Sorry I can’t check just yet, but I know I had this working as described in my old setup, I have just added the resource for me to check but there is a bit to setup for me to test.
let me have a play around with my setup as this is something I’ll be doing with minew anyways see if I can’t give you something pretty to look at. You could always just use a conditional card? I know how I did mine now I break out the no_motion_since attribute of my xiaomi motion sensors so maybe not able to do it without some trickery but I’m sure it can be done and now I have a new mision for the night