Change one fixture in a scene to a different scene

[webnerdnick]

I have 4 RGBW Led Fixtures, and I created 5 scenes:
Scene 1: All Fixtures Red
Scene 2: All Fixtures Green
Scene 3: All Fixtures Blue
Scene 4: All Fixtures White
Scene 5: Fixture 4 White (R:0, G:0, B:0, W:255)

I put those in a solo frame in the virtual console, and they work as expected.

Now, lets say I want to Select Scene 1 (All Fixtures Red), and then have a separate button to make just fixture 4 White (Scene 5).

How can I make that happen? If I put the Scene 5 button in a solo frame in the solo frame, I can get the fixture to go white, but it's also red at the same time. I've tried other various combos of frames, but haven't figured out how to just make that one fixture white, while zeroing out the other values on that fixture.