An outreach to Spain, if your idea about spain was for spiritual ends, doesn't necessitate moving there to either start a Church or to in some other way impact the culture. You could wind up someday having ministerial offices there that would give you a physical presence and address there that would allow you to set up a website with internet domain extensions that would be particularly to Spain and that would show up on search engines and directories in that area of the world that only focus on local businesses, ministries, personal webpages, etc. If you feel that your impact there, again, if there were a spiritual intent behind moving there, -- if you felt your impact was to be through your writing of fiction, poetry, or your direction of films, that doesn't mean that you wouldn't one day be in contact with film distributors there and publishers and bookstores in that area.
So anything goal oriented when it comes to your previous ideas/dreams of moving to Spain have a billion possible fulfillments. And either dual citizenship or actually giving up your US citizenship entirely to live there could simply be something that involves you in the decade long process. Or however long it winds up being. Moving to any new country winds up being a whole lot of hastle and everybody that ever does it winds up having to go through all of that. Spain's not the only country like that. Some of it may be the "Welcome to the post 9/11 world." But it's been that way for years trying to get a work visa and then to go through the full migration process of actually calling a new place either your new home or your home away from home.