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I managed to buy it here: https://store.playstation.com/en-us/...DLEGACY0000001
Log out if you don't have a US account else it forwards you to your region and a dead link.
I had to create a US playstation account, it was a lot of messing about. But I did notice when I downloaded it on the PSP and logged back in with my UK account it was still playable.
If I want it on my Vita I need to mess around with a second memory card unless as you say I jailbreak it.
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I think you need to purchase old PSP games VIA a PS3 or PC, then transfer to PSP/VITA via a PS3.....if buying via PC the game will show up in your store purchases.
The PS4 doesn't support PSP games as far as I know, at least they don't show up if searching the PStore using a PS4.