Enable the 10 min timeout. Then enable developer options in your settings by tapping "Build number" seven times in succession. Then toggle on "Stay Awake while charging" Then keep your phone charging all the time, but if you have to take it off charge, you got a ten minute timer to get it back on if your not using it for something. A wireless charger will work with the Stay Awake function.
And you can also enable the "On Body" detection in the Smart Lock setting. It will stay unlocked while it's motion on your person.