How cool is THAT!!!
Lots of this type of tailpiece around. I'm pretty sure Allparts has at least Hofner clones. Search "bass trapeze tailpiece" and see what comes up. I found this cool harp style
one. (bottom of the page)
You may have to replace the whole bridge. I can see just saddles being hard to come by.
I'd consult a luthier.
edit. Yes just swap the saddles back to where they should be. It won't effect the intonation.
Measure the pickups and start looking. Dunno about silver but black should be very doable. Custom ones might be something to consider too.