Ruger MK IV or Ruger 22/45 LITE, maybe a SR22. Some versions of the Browning Buckmark would be good. S&W Victory or M&P .22 would be equally good. There are a lot of excellent options. Hard to not like a good .22 handgun! Not quite sure I follow your thought process of the Glock sounding ideal, but you don't need to train with a Glock. If this .22 is meant to be a trainer buy one that models after whatever centerfire you are training with. Otherwise if the Glock is ideal, buy the Glock because it fits your needs. If it works ideally then it has merit on its own.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
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