got one of those cheap PS2 HDMI adapters, it works great if you force the correct video modes (some of the others also work, my screen just permanently displays "Input Not Supported" in the middle of the image) and it lets me play Guitar Hero with no detectable lag
turns out it's much easier this way, I previously couldn't get through Fire And The Flames on easy
@trwnh though thoroughly through the trough that is Through the Fire and the Flames
I was a bit sad that this wasn't just plug-and-play like the Wii one was but with being able to force video modes in OPL this has the potential to be much nicer