I’ve just come across this post, I am known over on the PCKF (Public Commander Keen Forum) as keen online and I think I might be able to clear up a couple of points:
1. Even though ID published source code for nearly all of their original games, they didn’t publish commander keens
2. Yes there is a GBC which can be played on an emulator, but it shouldn’t be because its terrible and the only reason why it was developed was out of revenge (long story).
3. I’ve build a couple of keen engines but unfortunately they were in flash and I didn’t get to far due to my lack of programming knowledge but I would love to try and have a go for the gp32
4. They were going to bring out Commander Keen 7 (8 & 9 the series was to be called ‘The Universe is Toast’) but due to Wolfenstein they never did and never will since they believe that commander keen is too childish for their likening.
5. You can try and get permission from ID but it is very unlikely that you’ll even get a reply let alone permission
6. In quake 2 keen can be seen to be hanging from a noose, this was said to be ID’s last association with the character
When I was younger, I used to dream about a new keen game. I have a whole sketchbook of drawings I did of an imaginary Keen 7. I drew Keen with not only a pogo, but a skateboard, a rocket sled, all kinds of stuff - all kinds of enemies, wacky levels, you name it. I would love to see it come to life.
7. Me too, I came up with the idea of karate keen
8. If you could get DosBOX to work that would be your best bet