Ummm,
You may want to go read that genetics 101 again yourself I'm afraid.
There is absolutely no reason you can't get a BP with multiple homozygous morphs in it unless they are all on the same allele.
If you breed a black pastel lesser (called a black platinum ) to another black platinum you can very definately end up with a super lesser super black pastel.
It would probably look like a super lesser with slight duckbilling but you could definately make it.
dr del