Use Siri to turn on or off a harmony profile by sending an email to IFTTT with #TurnOn as subject of the email.
Send IFTTT an email at trigger@applet.ifttt.com with a hashtag in the subject (e.g. #IFTTT) and this Trigger fires. You can optionally add a single file attachment (up to 30MB) and IFTTT will create a public URL to the file as an Ingredient.
This Action will start the Harmony Home activity you specify.