There should not be any Cameo looking chicks from these pairings. From the IBBS you will get Purple BS hens... BS pattern + BS pattern = all BS pattern. Female chicks will be Purple BS and Male chicks will be IBBS split Purple. From the Purple BS hen you will get all Purple BS chicks, Purple + Purple = all Purple and BS + BS = all BS. A sex-linked (Purple) male will produce all daughters in his color, but to get sons in his color the mom must be that color also. Good luck with that egg.
I really appreciate your patience and the way you explain things.

So in a nutshell, and considering that all the purple eggs will hatch together;
If the chick is Purple looking it is a hen, and out of the Cameos
If the chick is IB looking it is male and out of the Cameos and split Cameo or Purple.
If the chick is BS looking it is from either of the BS hens and could turn out to be either cocks or hens.
Then we wait until they start feathering to determine if they are Purple BS or BS split to Purple or just BS.
I really like and think I can remember the Purple + Purple = Purple and the BS + BS = BS. I remember the lesson of the sex linked color father producing sons only if both parents are either that color or split to that color. That is how I determined my IBBS was split to Cameo last year when he threw two Cameo BS and one Cameo son. Thanks again.