On camera flash is 'daylight' flash.
There is some arguement for setting twiligiht and sunset at this as well, the light is changing constantly so it would be impossible to have any useful preset, and the daylight preset is most likely to render the scene as you saw it, even if this isn't techncally accutate, in much the same way as the tungsten preset wouldn't be technically accurate for the light emiited from tungsten bulb with a red filter.
I can't help but think that if 400kelvins are pivotal to you then a) you probably shouldn't be using a rebel, and b) shouldn't be shooting jpeg.
I'm interested in how you know that your colour temperature is different? Do you have a colour meter? Or are you going by ACR or similar?
Here's the thing, I can't speak to the SL1, but my 600D (T3i) and M both have WB shift & bracket. This may be the solution to your particular problem.