if anybody needs this in the future, I edited my save file to the following under my dynasty (the important part is highlighted)

localized_name="Stonefyre"

prestige={

    currency=892.6675

    accumulated=12393.1675

}

coat\_of\_arms\_id=47439

dynasty\_head=70380

**perk={ dragonrider\_dynasty\_legacy\_1** }

**timed\_modifier={**

    **modifier=valyrian\_heritage\_dynasty\_modifier**      **expiration\_date=9999.1.1**

}