I spent quite a bit of time experimenting with "{EXP:}", which I definitely have a better understanding of now(and a mild headache, but no pain without gain, as they say).
The following should get you UTC for your timezone, in a single line:
Say, 'Current UTC time is {EXP: IIF( ({TIMEHOUR} - 10) <= 0,12+({TIMEHOUR} - 10),{TIMEHOUR} - 10)} {TIMEMINUTE} {TIMEAMPM}'
EDIT: Aha! There is a catch, of course there is! AM/PM would be not be adjusted for UTC, therefore the line must be:
Current UTC time is {EXP: IIF( ({TIMEHOUR} - 10) <= 0,12+({TIMEHOUR} - 10),{TIMEHOUR} - 10)} {TIMEMINUTE} {EXP: IIF( ({TIMEHOUR24} - 10) < 12,'A. M','P. M')}
Note "A. M" and "P. M", which will correct the pronunciation(with Microsoft Anna at least).
Now I'm going back to bed. When something like this pops into my head, I know I can't sleep until I work it out.