If you read below and what I posted above from ezcast, you will find some your own descriptions mixed up 🐈🐵😈
The difference between wireless screen sharing, screen mirroring and screencasting - Airtame
(Ignore airtame itself.)
Anyway drowning in terminology or asking for a new feature from volunteer devs is not the right way forward, imho. So I am going to pursue some experiments myself, time allowing:
1. Using the Video menu to acquire content from an attached USB stick, and then playing back on Kodi.
This is the easy part. A lot of folks have been doing it.
2. Using that add-on to create the download to USB stick context menu. Of course not all Kodi content will be friendly.
3. Using Kodi UPnP/AirPlay settings to stream, say playing TV channels, from PVR IPTV Simple Client to an ezcast wifi hdmi dongle attached to a regular TV set.
Above is more challenging than streaming recorded library media.
Here the question is whether UPnP AirPlay settings will stream *live* TV channels, and how to use the IR remote control of the TV box. Of course if you have Kodi on a PC ( Windows, Linux, Mac) you might be using a USB plugged keyboard/ Air Mouse, which should all be well supported by Kodi.
(Streaming has 3 components: server, client and control. Some or all might be combined and that is the main technical issue for Kodi.)