>Sadly, I am unaware of Nest and/or Ecobee's support for this sort of a setup. Probably not cost effective for them.

Ecobee has a setting to enable this: https://support.ecobee.com/s/articles/How-to-use-AC-Overcool...

They also have a setting to adjust the temperature for humidity: https://support.ecobee.com/s/articles/Adjust-the-Temperature...