Unfortunately, I do not have any such disks, but if you want to write your own TSR, you could use my mode 13h compatibility TSR for later Tandy systems as a starting point.
Incidentally, I also wrote a Plantronics ColorPlus driver for Sierra adventures that you might want to try on that machine.
AFAIK, the Commodore Colt was a rebadged PC10-III or PC20-III. The PC-1 is somewhat different.
I suspect that the TSR they mentioned was a primitive fix for some missing or buggy BIOS routine.
Planet X3, including the Plantronics code, does not do any CGA hardware detection. I know that for a fact.
If you only care about the character graphics and not necessarily the actual ROM content and layout, you might want to take a look at the VOGONS thread 6€ MCE2VGA replacement - CGA/EGA/HGC capture with logic analyzer.
It is about using a cheap 8-channel 24MHz USB logic analyzer dongle as video...
One interesting aspect of this machine is that the on-board video chip supports 320x200 pixels in 16 colors in a Plantronics ColorPlus compatible mode. Software support leaves a lot to be desired, but you can use cshow and my SCI driver for Sierra adventures.