It depends on how you feel about the aesthetics. You can use a smart switch cover, mentioned in the FAQ I linked to above, over pretty much any switch. The Original switch stays turned on, but you can use a smart switch cover without cutting the current to the bulb.
The Sylvania lightify dimmer switch could be used at both switch positions.
https://www.amazon.com/SYLVANIA-LIGHTIFY-Osram-Products-required/dp/B0196M620Y
The new Lutron dimmer switch is nicer looking, but it doesn’t come out until next month and we are not sure if it will work directly with smartthings or only for smart bulbs attached to a hue bridge.
It would also be possible to use the gocontrol accessory switch at both locations, but you would have to Hotwire the load from one of them, and it sounds like you don’t want to do that.