If you have them per-channel, you'd get the same result you require, but different colour, making it easy to read.
If you wanted 2 or more (up to 12) on the 'same' channel, then the Pico MixMaster is probably what you want. (Check with Support first.)
Knows pre-2000 Fords and R33's better than the back of my own hand.
Anything newer... I'm probably driving it