If you don't mind owning a Chinese set (often cheap rubbish but even China has some manufacturing history)... Try XOCECO.
The only XOCECO sets I have ever laid my hands on in The Netherlands, were rebranded. Probably as Multitech, Frontech or Prima. I'm not sure if those would count as sets with an X, though
For Q you could try and find a Quasar set, that was the premium-brandname Panasonic used in the USA.
My collection at this moment is also large enough to fill a museum floor in the united TV-Museum, but it is much less interesting than yours and in need of some maintenance and parting out (only a few sets actually play regularly).