GOG's version of Dungeon Keeper appears to work with CXG ver. 10.1
The setup I used is as follows:
-Installed in a new win98 bottle, in default directory (exit after install is finished, do not launch the game)
-Ran Graphic Mode Setup from the Dungeon Keeper menu
under "Basic" tab, select OpenGL, uncheck full screen to run in window mode
under "Advanced" tab:
- select scaling:
either none, any normal, or any advmame (others seem to work ok for the game, but not the video). - select screen resolution - start around 800x600 and fine-tune it later (currently using 1280x960)
*save settings and launch game
- once you are past the menus and into the actual gameplay, don't forget to press Option-R for dosbox high-rez mode.
I have not done extensive testing or anything (I've only been running it for about an hour), but so far, it's been stable.