Thank you, I'm looking forward!
Megademo 6 is a standard AmigaDOS disk. From a quick test in UAE, it's sufficient to load the executable '1' from a hard disk, with all other files removed (I got this hint from the a1k.org thread - thanks there!). I hope that helps speed up the initial diagnostics.
As for seldomly-used, unfortunately this also affects at least one game - please have a look the a1k.org thread for extensive photo coverage on that, too.
If there's anything else I can do to help, please let me know.