Tony took a while to get back to earth after AIW, and was a wreck when he did. Even if he'd been together enough to work on The Vision, he didn't have a handy Mind Stone lying around, the energy of which being what it took to kick start Vision1.2. Designing a new element is child's play next to replicating an Infinity Stone.
Regarding time travel Tony tells Pepper he "finally cracked it" or something to that effect. He'd likely been working on it, at least theoretically all during the snap in an attempt to get Peter back.
He wouldn't have had the same deep seated need to fix Vision. He probably gave up trying fairly quickly.
I assume that T’Challa probably had Wakanda “smiths”/super-metallurgists repair the shield from the scraps after the battle was over, as part of that broad, vague time-span during which everyone gets patched up, gets their tailored suits out, and attends to Tony’s funeral while Bruce/Pym work on rebuilding the new time machine Steve uses.
I mean, this is the land of fiction, where people can just heat up and re-attach metal to metal without having to melt down and reforge the whole thing, but it’s also Vibranium and Steve was at least in “game recognizes game” bro-hood with the King of Wakanda.
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Something that occurred to me. How did Bucky know where to find Isaiah if the military declared him dead?
While this was strictly "I'd Guess..."?
Bucky seems to have memories from his entire time as The Winter Soldier.
If someone had worked something like Isaiah not actually being dead out? I would suspect that it would be the folks involved in the "The Winter Soldier..." project.