So is there actually any program that can produce .cdi format?

It seems really, really, inconvenient that the only way to load from a disk image on a Saturn requires a format that is used only by one proprietary Windows program. Is there *any* way to convert a bin/cue to .cdi aside from buying a copy of Discjuggler (and since I'm on Linux, booting to Windows)? If the format is simple enough that you need to use it as a format for disk images, surely someone has at some point written a simple command-line conversion program?

 

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CUE/BIN does not necessarily include subchannel data, so should conversion tool fake it if it's missing? Other than this, CDI is closed, and while converting from CDI is relatively easy, generating valid CDI from raw data might be difficult if you don't know every field's meaning.
If you're into writing tool like this, look at libMirage, its sources contains reverse-engineered info about CDI format.

 

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discjuggler demo version is free and only limits burn speed and a data limit (think it was 700MB (this is not the size of the disc image but the data contents) but that should not be more than any saturn game), the demo does not expire so you can use it as much or as little as you like