Patching dimmers as a Generic RGBA fixture?

I have a set of 4-cell tungsten cyc floods, coloured red, blue, green and amber.  Is there any way to patch the dimmers as a "virtual" RGBA fixture?  Sadly, because of some loading and cabling issues I can't assign consecutive dimmers to them.  Is it possible to have a "fixture" with non-consecutive dmx addresses?

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