That would be great but seems like it would need to be very tight tolerances within a quarter millimeter or less, because you would want to be able to use the existing holes already drilled into a guitar body, and if it is off-spec, then you would stress the wood even more when you press it into the body, not to mention need to assure the Floyd will seat properly on the posts. But if you are a good metal worker then could probably pull it off. I guess if you fabricated and drilled the bar first, then pressed in the inserts to make sure it all is within tolerances, then maybe spot weld as a final step, that could be cool. Then probably want powder coat so it doesn't rust. That's a lot. I guess maybe that's why nobody has done it!
Check out this video. This is the cleanest and most solid repair I've ever seen for this problem, but I think they might have over-engineered it. My idea was do something similar but without the lip on front, smaller without the rounded contours, basically same idea but just shorter and simpler. But check this out and it gives some good ideas to think about. I don't recall if it is on this vid or not, but I remember hearing the owner of this guitar said the sustain was so much better than original after this repair/mod.https://www.youtube.com/watch?v=dm0RQ5c4Osw