
I am an avid fan of Legends of Dragoon. That game was my childhood.
However, I've got to say that I think there are far simpler and easier ways to go about achieving such a character that stays within the setting of FFXIV without bringing in other-worldly concepts and trying to force them to fit.
As you mentioned, a dragoon (note: not the Azure Dragoon) does not have to use a lance and is any Ishgardian who proves to the Holy See that they've slain a true dragon. Your hypothetical character could very well have been an Ishgardian chirugeon or conjurer who took up the bow when their husband/mother/father/brother/village was destroyed in a dragon raid. Having taken up the bow to fight the war, they eventually fell one of the dragons responsible, thus claiming the right to be called dragoon. From that backstory you could go almost anywhere, it maintains all of the basics of your concept, but remains within the setting, and would probably make for a more dynamic character. No soulstone even required, as a bonus.
If having one of the central characters (Shana) from Legends of Dragoon be your character's parent is necessary you feel or this is still just a concept you want to just roll with, by all means, but I personally think there are more fluid means at achieving the same or similar. Let Legends of Dragoon be Legends of Dragoon and FFXIV be FFXIV, in other words? Idk.
However, I've got to say that I think there are far simpler and easier ways to go about achieving such a character that stays within the setting of FFXIV without bringing in other-worldly concepts and trying to force them to fit.
As you mentioned, a dragoon (note: not the Azure Dragoon) does not have to use a lance and is any Ishgardian who proves to the Holy See that they've slain a true dragon. Your hypothetical character could very well have been an Ishgardian chirugeon or conjurer who took up the bow when their husband/mother/father/brother/village was destroyed in a dragon raid. Having taken up the bow to fight the war, they eventually fell one of the dragons responsible, thus claiming the right to be called dragoon. From that backstory you could go almost anywhere, it maintains all of the basics of your concept, but remains within the setting, and would probably make for a more dynamic character. No soulstone even required, as a bonus.
If having one of the central characters (Shana) from Legends of Dragoon be your character's parent is necessary you feel or this is still just a concept you want to just roll with, by all means, but I personally think there are more fluid means at achieving the same or similar. Let Legends of Dragoon be Legends of Dragoon and FFXIV be FFXIV, in other words? Idk.