I still think it’s worth some exploration on the TV. If you have a Framemeister handy, you can set it to output DVI signals. My TV doesn’t have a DVI input, but apparently DVI over HDMI is common and accepted by some TVs.
I tested my TV this way and found that it accepts about half of the dozen or so DVI signals that the FM can output.
Don’t mean to be pushy, but like you I find the PQ of Panasonic Plasmas is way ahead of most LED and LCD sets. I was hugely surprised and happy as the proverbial ‘pig in muck’ when I found I actually can use the extra OSSC modes on it.