Or, rather, you can get the colorizer out (12/13/14, on the back), but you will create a feedback loop if you do because you will also be putting your composited image back into the colorizer for final encoding and output.
You will have to send the individual outputs from the pattern generator section (16-36, 49-51) out and create your mixed pattern in whatever you use to do the compositing (Cortex, Marble Index, etc.), as well as the output of your luma processor (10) or just the camera output (48), if you don’t need to process it.
And then the resultant composited image would go back into the colorizer CV inputs (52/62/72).
Depending on which module(s) you use to do the compositing, you will probably lose some of the functionality found on the Vidiot colorizer (some of the per-channel inverting for instance, or the solarizing) and so it may be hard to recreate the exact pattern you had on the Vidiot externally without adtl. modules. But it is impossible for me to say exactly what you will need to use in all cases because Vidiot’s option set is unique. You can recreate any given mixture of effects with other modules, but which modules will depend on which exact outputs/inputs you were using to create your initial pattern.
But, if you want my advice on a single module to add, I would recommend a Visual Cortex. It does the compositing you are looking for AND has some colorizing abilities similar to Vidiot. Also has built-in hard keying. Plus has the addition of a ramp generator, which is very useful in pattern-making. And then its multiple outputs can also be handy (for genlocking a camera, for instance).