I have never seen a quick release tailstock such as you are suggesting.
I have made many HRT210 mounted "horizontal tombstones" that are used in production work on our Haas machines. They are not really tombstones but are rotating carriers that accept removable fixtures that hold several parts; one fixture is reloaded on the bench while one is machining on the carrier.
Our parts are too large to load multiple sides of the fixtures but for small parts you could load three sides of a tombstone-like fixture that attaches to the carrier on the fourth side.
I have started several threads showing my stuff, you can get a list by clicking my name and going to my info page.