Shirou (Fate) x Jojo’s Bizarre Adventure

I've recently been quite interested in Jojo's Buzzare Adventure. I've yet to watch it, however, so I'll explain the idea I have here as well as I can with the details I have at my disposal.

I'm not sure if I've ever seen this idea done before, and if it has been done, it's always been done in the world of Fate rather than Jojo. As such, here is the idea: what if Shirou Emiya was of the Joestar bloodline, complete with his own stand and everything but with the same personality?

There are multiple ways to go about doing this. Shirou could be reincarnated in the world of Jojo, with the abilities of Unlimited Blade Works as his stand, and with memories of his previous life. I'm not sure how the reality marble would work, so you might have to exclude that entirely. Another possible thing you could do is have it so that Shirou was always a Joestar, and has no memories of a previous life. His stand would still be the abilities of Unlimited Blade Works, but the story of his life would have to be heavily altered.

Continuing on with the idea of Shirou always having been a Joestar, this is the way I would do it if I could, but that doesn't mean you have to do it this way: I would have it so that the Fuyuki fire still happened, with it no longer happening in Fuyuki, and that Kiritsugu still adopts Shirou. A heavily modified holy grail war would also take place, adhering to the rules of Jojo as much as possible while bending some rules as is necessary. (This would only be after Shirou meets with his true family.) Some of the differences here are that Kiritsugu's time alter would be one of his stands, which would fit in nicely with all of the other time-stopping stands, (with his severing and binding ability being his other stand), and that Kiritsugu would live/ die later in a different way that in canon Fate. I'd have him die in the holy grail war after having taught Shirou about stands and everything he could about them, which means he would also meet with the Joestars at some point or another. Kiritsugu would be a well known mercenary for the Speedwagon Foundation, (I think that's it's name, I could be wrong), and he wouldn't have as bad of an image in the community as he does in canon Fate. It is, at some point or another, discovered by the Speedwagon Foundation that Shirou exists, and so Jotaro Kujo is sent to talk to him about it. The holy grail war then begin, however, throwing everything into chaos. Alternatively to the last parts of what I stated, you can have it so that Shirou lives in whatever time period and part of Jojo you'd like to include him in. It does not have to be after Stardust Crusaders. Despite all of the thinking that has gone into this, however, I think I would still personally prefer if you went with the idea of Shirou being reincarnated over this.

Going with the idea of Shirou being reincarnated, not much would change from what I stated above. The only real differences would be that the fire doesn't take place, and Kiritsugu may or not exist as Shirou's biological father depending on if you want him to exist in the story or not. No modified holy grail war would take place, either, and from there you can kind of just throw in Shirou wherever you want. You can have him join the story of Jonathan, Joseph, Jotaro, Josuke, Giorno, or Jolyne, or even just create your own story for Shirou set in whichever time you'd prefer. I'd throw him in either during Stardust Crusaders or after that part, but you can do as you'd like.