The Alarm.com scenes feature has not been released yet. It’s being developed and should be released some time this year, hopefully sooner rather than later. If you search this forum for “scenes” you’ll find my constant ranting and whining about Alarm.com not having scenes yet. Here’s an example.
I think the Leviton scene controller should work but you would have to make it the master controller and then add your 2GIG panel as a sub controller. Here are steps on doing that with a Vera z-wave controller. You would need to replace steps 1 & 3 which refer to Vera with equivalent steps for your Leviton controller.
Oh yeah, and you would have to remove your z-wave devices from the 2GIG panel and learn then into the Leviton controller since it’s the master. Then when you add the 2GIG panel as a sub controller of the Leviton controller it will inherit the master’s z-wave devices so they’ll show up in 2GIG as new devices… and you’ll lose any existing Alarm.com z-wave programming you’ve already done in the process. Sorry.