A&I in LA has a process called .dr5 for producing B&W transparencies from both Scala and normal B&W films. Their web page says they'll do Scala at 200 or 400.(posted 8606 days ago)http://www.aimcolor.com/dr5.html
I've used A&I for regular slide processing, but not .dr5. However, I have read many excellent reviews of the process.