I know it's irritating to answer a question with a question - but why would you want to do that?
If you have band recordings - I totally understand. But if you have solely made projects, like any "electronic music", I think you can forget using SSL mixer. Converting instruments being hooked up with "old" line (6:2) and main (14:2) mixers just creates overhead audio and mix track devices (thus probably making audio routing more time consuming, depending on how it's coded - Propellerhead guys?
) but at least increasing units in your rack. In my experience SSL mixer does not give any value for editing the sound for these instruments in this kind of case because you can use combinators etc... and also keep your UI tidy.