Dumb Question: Could a son of Queen Ulrike Eleonora and Her Hessian Husband Claim Courland?

Sorry for my second dumb question post, but this is a thought bunny that popped into my head. It's probably a long shot if anything.

Ulrike Eleonora had two pregnancies that both ended in miscarriages, say one of them was a boy and said boy has his grandfather (Carl XI)'s brains for administration and Carl XII's talent for soldiering (but is more intelligent), i.e. basically a sort of Gustaf III come early. Could he take it into his head to conquer Courland by citing his relationship to Ferdinand Kettler. Sure, his paternal grandma was the youngest of Jakob Kettler's daughters, but if this kid (Frederik or Carl seem as likely names as any) were to make use of the whole Russian mess during the 1740s (Russia went through three sovereigns in a year (October 1740 to November 1741)) could he claim the duchy. It doesn't have to be successful (or even lasting if it is. Courland had a non-Russian ruler from 1740 to 1763, and only annexed it in 1795, during the Polish partitions), but what would be the effects/results?

Sorry if this seems like a dumb question.
 
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