I just learned that there is a Colecovision version of Gateway to Apshai. I had the ROM all the time, but never realized it.
Anyway, get this, it doesn't seem to have the Dungeon 7, Level 8 bug. It looks and plays exactly the same (except for the pixel aspect ratio) ... but it has completely different dungeons. In fact, it apparently has 99 different dungeons of 8 levels each instead of the usual 16x8. It still fits in a 16KB ROM. I didn't try all of the dungeons, but I did try first 20 or so and there no problems so far. I haven't really checked out the code yet, still looking for a decent Colecovision debugger.
The Colecovision version was written by Marc Ferguson and is copyright 1984 (a year after the C64 and Atari versions).