Has anyone tried to build a new one? It looks pretty simple. I bet you could do it with an Arduino pretty easily. Plus, then you could program it to do all sorts of crazy / accurate things. Interesting thought...
Doesn't the Müller scanner use a laser to register the perfs? That should still work, right?
On the other end, I've converted a projector into a scanner, which has it's own issues, but processing density certainly isnt one of them. I've got a bunch of super 8 stuff I scanned on youtube and all of it was hand-processed as negative.
I've actually got a Nikon to ACL adapter, so they did make them.
I'd keep an eye on ebay, a decent looking ACL kit just sold today for like $550.
If the sensor sizes are the same, you should get very similar results, so if it works on the BMPCC, I can't think of a reason it wouldn't on a super16 ACL, other than lens mounting or possibly backfocus issues.