Hey JD,
the FAQ section was the first I’ve read and searched so much around of the forums as well.
I was able to find different DTH but as far as I can see none of them are able to do both.
The default one by SmartThings is able to turn off automatically if I use it with the multipurpose sensor but isn’t able to trigger an Alexa routine because it’s not recognized by the Alexa app as a trigger.
The other ones I’ve tried ([Release] Virtual Alexa Switch/Button) can be used as a trigger but won’t turn off automatically. 
I don’t know if my location (Germany) changes something about it.