@peter-gamma There is NO such thing at the moment. The only two ways to use a transparent solution is whether to use the slimport cable and a Nexus 5, or to use Miraclecast, as discussed in the thread where you decided to start that one. Sadly, it seems miraclecast uses a protocol that is not fully recognized by UT. Last thoughts: if privacy is what you're looking for, I wouldn't be too scared of the Miracast dongle. While Google likes to be perpetually online, and usually stores voice and other data, the Miracast is actually an old thing by industry standards, from a time where sharing your whole life with the www for money was really not a thing (that is, before Windows 10). I think it's pretty safe to use, especially offline
