I mean, there are chai teas with shots in them..."dirty chais" They are not very good though IMHO.
Red Espresso is a Red Rooibos based Espresso method which has the Red Tea ground fine & shot in an espresso machine just like a "black" espresso. The Red Espresso is made to use the regular porta filter & basket with a 20 second infusion before pulling the shot although they have baskets made for Red Espresso that allows you to straight pull the shot without preinfusion. As to using a different group head, I dont (of course I dont have the space for a 2 group machine) & just rinse & wipe down the group head before & after use. It really doesnt "contaminate" your machine if you do a good job of rinsing & wiping down immediatly. Now I would suggest at least using a seperate portafilter. I love the Red Espresso & I've even started making a Red Chai Charger (Chai with a shot of red espresso). Red Espresso is naturally decaf & high in antioxidants (and tastes good too!) It makes an awesome drink they call a Fresh Red which is a cup of juice (white grape, orange, etc) with a 2oz shot of red espresso floated on top (beautiful) Do that with an orange juice & you've got a super antioxidant drink. It goes well in Red Lattes & flavor wise mixes well with spice (gingerbread, pumpkin spice, cinnamon) and berry flavors as well as vanilla & white chocolate. Many many years ago I was at a Coffee show & someone was doing a Chai in this method (a real chai with the black tea leaves & spices ground up fine, not instant) & it was awesome. But I never saw it anywhere else again. I was happy to see the Red Espresso. Highly suggest it.