So, some searching and searching and a lot of gas later, I tracked down some hex-capped replacements (M4 -0.70 x 25mm bolts).
However, since they didn’t have a thread-free shoulder like the originals, I thought it best to use a needle file to slightly widen the lens holes so the screws didn’t grip and put pressure on the lens while going in. Next I used a M4 0.7 tap to chase the threads in the housings so that the new bolts spun in easily, but snuggly (the silver paint had tightened things up a bit, so this step really helped).
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