Efke made the ortho film that's packaged as CMS20 (though I'm not sure they make the CMS20 II). This stuff is reputed to be originally a microfilm emulsion, but microfilm bears a suspicious resemblance to ortho litho film: slow, very high contrast, very high resolution and sharpness, and fragile emulsion. I've processed CMS20 (the original) in Caffenol LC+C with very good results at the box rated speed of ISO 20. For reference, this developer will give EI 64 and good tonality with Copex Rapid, so might increase speed into the 20-32 range on Ortho Litho 3.0.
I'd expect any developer that works well with microfilms to give good results with Ortho Litho (2.0 or 3.0). As a bonus, many pictorial developers for microfilm give a speed boost (due to use of phenidone, which also helps control contrast, as well as high dilution and reduced agitation -- I used to agitate the first minute, then five inversions halfway through the development time, with 35 mm in a daylight tank).
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