I think just the outline of the two states on the back (front )would work. The color of the outline could show the other time zones (clocks in the same color). No names. No zones named. Reformat the lettering around the outlines.
Simple.
And if anyone else wants to start up the other time zones of the world to complement this design or take off with their own design - go for it.
I like this idea. Perhaps you could split the back half of the Central coin, and put the outline of Alaska and Hawaii on the bottom half?
I like the black background with silver logo (did you say you can do that?), but if you do the regular 4 color logo, I'll buy it, too! The star/leaf cutout could be interesting, but don't lose the wording on the front of the coin in the process.
Well, I'm in for one gold and one silver, maybe more when the other metals are selected! (The only connection I have to Canada is my 8-year-old geocaching daughter's TB is in British Columbia at the moment!)