Red over white to blue color bump

[ljmartijnw]

Tried to search the forum, but did not find it. Got a question. Last weekend I tried to build a nice color bump: Red to blue in the colorwheel, quit easy and pretty cause it will bump over white cause its in the middle of it!
Now here's my challenge, I want my LED;s to do the same..
I tried to build a cue in between that has the white info for it, but in the end that takes to much time. It doesn't make that snap.
Anyone got a solution for it?

[niclights]

I can't really see how this could be done due to the speed limitations of DMX. It needs to be something the fixture does.