Squirrel, memories are fading but there is some evidence that 617 was not operational with Blue Steel but that some crews were operational with Yellow Sun. They were brought to RS15 but there is no direct statement whether they were BS or YS armed.
There is other evidence to suggest that they did not have an operational BS capablity.
Finally I know that initially the BS was LimOp for ballistic release only.
As aircraft we converted to the BS role FF aircraft would be withdrawn for modification. The only way to cover the assigned targets would be for the BS aircraft to be immediately LimOp.
Bit vague at the moment but still looking. Hope that helps.