Ehhh, male or female, king consort or queen, they are essentially gonna be on the throne either way. Especially if, as the plan name kinda suggests, we foster strong bonds with them and our own heir.
I'm a bit confused on how this is meant to work.
Lets assume that Laena has at least one boy and one girl
Then lets assume we have at least one boy and one girl.
Lets assume The boy is our firstborn. We marry him to Laena's daughter. This might assauge Corlys who'd know that his great grand child could sit the throne via the child of our, but it doesn't deal with our half brother having a better claim then us under Andal succession laws, who'd need to accept that he won't inherit despite that.
Lets assume our daughter is firstborn. We marry her to Corlys' grandson with Corlys' grandson inheriting the throne after us while being married to our daughter.
That might work, but it does leave two issues:
1) Corlys' grandson needs to be willing to accept inheriting the throne only after however many we end up living despite having a better claim then us under Andal succession laws.
2) It'll require any son of ours to accept being passed over for the throne despite having a better claim under Andal succession laws then his sister.
As was discussed, if you want to be crass about it, the planned Renly route.
The Renly route never worked with Renly though...
People who want to romance Alicent seem really willing to bet the farm on the idea that we can compel Laenor to have sex with us without even checking his opinion on that.
What makes you think that? We still need a guarantee that he keeps to the plan, and Gwayne is no dragonrider. And heterosexuality is a drawback, in a fashion.
Gaining Seasmoke is not worth losing Silverwing, Vermithor and Dreamfyre in case Laenor won't give us kids.