You could look into it, my concerns for whatever they’re worth are whether the mother of the planned future child wouldn’t feel a little put out by this, you’re kind of planning who her child will be and maybe cutting out any of her own options, her own ancestors maybe who would want to be born into the family?
And what if the relationship broke up, would it make you feel a need to retain custody even if for other reasons it wasn’t the right choice, even if it limited your future chances of finding another woman, or of travelling to far off places or moving to another country for a while or something?
And would you be able to detach enough from the person she was, to give her next life a chance at being better? I’m not saying you couldn’t or that any of the above stuff would automatically be bad for you both, but it’s something to think about, it would be terrible if she was raised with the cloud of her past life hanging over her and defining her identity.
There’s also the issue that this women was disempowered enough to die young before, and then fears moving on - if she’s born into your life again she may continue a cycle of dependency, and do you want that in your child?
I plan to have kids and I’m intending that, just as loads of us here had parents who were against spirituality outside their narrow definitions, I’ll be given a son or daughter who wants to be raised from the start with these options, in an environment where these things are normal and good, and who will ultimately become more competant and powerful than I am. I’d probably love them even if their ambitions begin and end with reality TV shows, but it’s not what I’m hoping for.
Maybe it’s a chick thing and just my beliefs and stuff, but that’s what came to mind reading this.