@meyerdenney, the only way I know how to that is to setup your TRIGGERcmd command as a SmartThings switch because your SmartThings devices show up under Smart Home in Alexa routines.
EDIT: @meyerdenney, I'm looking into creating a TRIGGERcmd Alexa Smart Home skill. That should solve this. I'm planning to make each command act like an on/off switch, just like the SmartThings integration.
EDIT 2: I finished the TRIGGERcmd Smart Home Alexa skill and it's awesome. Alexa can recognize your words much better with this TRIGGERcmd Smart Home skill because she knows the limited set of trigger names.