I would ditch the buckpuck and go for resistors personally. I believe (could be wrong) you need 1 buckpuck per LED (or at least 1 per color) anyways, so resistors would be smaller for the same thing.

Don't see an issue with being able to unplug the wiring from the Red LED separately, as long as you don't do it while power is being applied to the system...

Would also caution with the dR vs a regular R LED; I have heard they are harder to mix with the rB's, as they produce light more on the limits of what humans can perceive. But that is just hearsay, someone who has actually done it would be able to comment on that.