I think that would look awesome! If a pink color is seen with BR/AS, then a VA type color should appear with BR/AB, and I think that would give a nice effect. The general forum concensus for BR's FoC pairing is FO, but with some thought, I think I'd lean towards a BR/AB combo.
My first saber will be the consular, in CG/AS, and quick disconnect. I think I'll order an extra MLS unit in BR/AB, take the shroud off the consular and swap out the LED when a sithy mood takes me. The arctic blue is still a light colour, so I hope it turns out kinda white/blue/violet -ish.