LOL I'm a risk taker, and prices in Australia/shipping from UK are high, so I used an Aliexpress swirl flap kit for $A40 (about the cost of a genuine swirl flap linkage) like this:
https://www.aliexpress.com/item/1005005262067417.html
It seemed OK quality, and OEM swirl flaps are not great anyway....
I cleaned everything, including the injector seats with dowel and some very fine sandpaper glued to the end of the dowel, and reused everything else, including the clamps, which I bent back to provide tension.
Apparently injector seizure is rare in D5s and mine came out easily. Kept them in order though.
Everything has been fine - no diesel, injector seat, or oil leaks, and swirl flaps are now functioning. Runs a bit smoother, but not a massive change to performance.