Recommend a switch wich 2 switches

[JDRoberts]

Single gang box? Or double gang?

For a single gang switch box:

Dual Switch Solution

The Leviton vrcs2 is a two button scene controller that’s perfect for this except that, like most multi devices, it’s a bear to pair with SmartThings. But some people have done it. And another similar topic. This may not be worth all the work it takes to get it right, but it worth knowing about: Of course you might not like the form factor, it’s different than what you have:

For a dual gang switch box, there are several dual relays that have been certified to work with SmartThings and can fit inside a dual gang box.