Wes and PAK -
I can see this becoming a much bigger problem as more and more people start self-pollinating their prized plants...
Although you could refer to these seeds as S. 'Leah Wilkerson' x S. 'Leah Wilkerson,' I would say that there is a VERY high likelihood that somewhere down the road, SOMEONE is going to mistake this to mean that they are the cultivar named S. 'Leah Wilkerson.'
To prevent this, I usually prefer to refer to seeds produced from selfed plants as F2 generation. Thus, the seeds mentioned above would be called S. 'Leah Wilkerson' F2. But this designation will only work if the person who gets the seeds/plants knows what this means.
Of course, the BEST way to not allow for confusion would be to call them exactly what they are, which is S. x moorei from the Leah Wilkerson bog. That way you could let people know that the seeds are produced from the HUGE cultivar called 'Leah Wilkerson' without there being any danger of confusion.
Regards,
Mike