Your post is a wall of text but I have a similar 32GB machine called the Asus T100. But here's the difference. Mine has a 500GB HDD in the base so the upgrade to 10 required a little finesse.
Now I'm unsure if you are ranting or expected MSFT and HP to document how to get these to W10.
As to WMC, I experienced troubles in WMP years ago and ignored it since. As to a WMC in Linux, I haven't seen a clone that is the same but in W10 my thought is the TV card maker needs to supply an app.
Sorry if I didn't answer your questions but here, the 32GB T100 is running 10 super. In fact, 10 to me was what 8.1 should have been.
I've submitted this issue to a Microsoft Forum but expect the run-around that they usually give users. I got a message that the November update failed on my HP Pavilion X2 that I bought last year from Microsoft. The failure was because the update requires 4.67 Gb of disk space on drive C: Of course, it only has a 32 GB drive, and if I remove ALL of the programs and ALL of my AppData folders, I could barely get the required 4.69 Gb that the update requires. I did the disk cleanup and only recovered 433 Mb. I did a system cleanup and recovered about 200 Mb. Basically, I recovered nothing close to what is required for the update. When I got the error message, it appeared to give me a choice of using the D: drive which has 22.5 Gb of free space. (It said I only needed 10 Gb.) So, I checked that box and then got a message saying that I needed 4.67 Gb on drive C: and that the 10 Gb on drive D: only was for recovering in case the update didn't work. So, the question is: Do I have a bricked Pavilion X2? It appears to me that there is no possibility for me to do any more updates/upgrades with that PC. If indeed it is a bricked PC, is my best bet to go with Linux and forget Microsoft altogether. I have four more PCs that are supposed to go to Windows 10. One of them has a Hauppauge TV card in it and requires Media Center, which Microsoft dropped altogether. I cannot possibly upgrade that from 8.1 to 10, because Windows 10 does not have Media Center or any replacement for it. Back to the question for this posting: 1) What am I supposed to do about the November Update given that I only have 2.09 Gb free space on Drive C: 2) Would Microsoft advise me to convert to Linux and forget Windows 10 altogether? (I'm quite familiar with Ubuntu and can switch in a flash--well maybe a couple of hours.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic