I don't think it is possible.
When femenized seeds are made a female is given hormones on a section of the plant to turn it male.
Male=xx
Female=xy
Here is a scientific chart.
x y
x xx xy
x xx xy
Y (Female) is dominant, so when a male is crossed with a female (Regular seeds) It is a 50/50 of male or female
When a female is given hormones it loses one of the x chromosones so here is the result of a self polinating plant.
x y
x xx xy
y xy xy
That last xx is not a male though, it is the chance of a hermy. Might not be exactly right but i hope it helps.