So you're saying dump it on a hard drive, plug the hard drive into a USB port on my blu-ray player? I"ll see if that works. But yes, blu-ray burners really aren't that much. Amazon has them for under $60
Follow these steps with the MKV to remux it into an AVCHD file that can be read from a thumbdrive by a Sony blu-ray player or PS3 (without further compressing into the 9gb file size for burning onto DVD-DL):
This 18gb AVCHD file has played in every Sony blu-ray player I've tried (old and new) with USB playback, with the exception of the PS4.
I think it looks much better than the DVD-DL and of course you get the incredible DTS-HD MA soundtracks, which blow the lossy tracks on the DVD-DL out of the water. Use the same process for Empire Strikes Back 2.0.