You can use /filter -a to sort a hidden window. Presumably you're not hardcoding the channels, so they're coming from a list anyway, which means you can /filter from some "channels.txt" input file.
This is sort of a cool trick, but it won't give you a uniform distribution. (For example, the first channel in the list will be more likely to appear first after the "sort" than other channels.) I wouldn't recommend this method if you're looking for unbiased results.
