UPDATES:

jerryshadoe kindly sent me the german 5.1 soundtrack; I managed to find out the german subtitles, but the file is only a .srt - maybe CatBus could convert it to make it looks like the other ones he sent me...

I managed to use the HDTV to fix the shots with artifacts; it's quite *simple* (cough, cough...) - just overlay the rescaled HDTV on the upscaled DVD, and it's done... well, if the settings are the same for the whole movie, it could be defined simple, but actually, there are MANY different settings that changes scene by scene... at the moment, I found only one that is almost perfect, and it took a lot of time to find it... I strongly hope that just few settings could be used, or it will take ages to find out more than few ones...

By the way, here you are a preliminary test; top, upscaled DVD, bottom, upscaled DVD with HDTV rescaled on top of it (click for larger image):

(if you can't see the image: http://s27.postimg.org/e4zlsc6w1/matrix_083217.jpg)

OK, not blu-ray quality, but better than upscaled DVD...