Still able to change temperature when status is "N/A"

[migueldc73]

Most of my climate entities keep the temperature set point online even when the climate is off, but my pool heatpump does not.

This custom card does a good job in showing "N/A" as a fallback when the heatpump is off, but it's unfortunately still possible to change the setpoint :

But what makes it worse is that when someone by mistake does hit the setpoint up button, it changes the the setpoint to 0.5 degrees, which of course a value nobody wants.

How can we disable the setpoint selection when it's N/A like in for example the mushroom thermostat card ?