Your only option for side bags without fabrication is soft luggage, or any luggage that does not tie into the passenger foot pegs for stability. They are not in the same position on the DS, and the bolt holes on the foot pegs are different.
The only hard luggage option I'm aware of on the Scrambler is the Givi rack (which you can use their panniers, or many other panniers). The touratech rack is vaporware. I tried the Givi pannier rack myself for my DS, and you could make it fit by fabricating an extra bracket to connect to the passenger foot peg, but it doesn't fit out of the box. The same will be true for 100% of all pannier racks not designed specifically for the DS. I just returned mine.
Unfortunately, I think we have a long wait for anything legit (a real pannier rack) to come out for the DS since it's going to be a fairly small market. Fabrication may be the best answer.
The most space for soft luggage designed for the Scrambler is probably the Kriega Duo 36, which is 36L of total space. I use these with a 40L wolfman expedition duffel. Between the two that gives me 76L of space, plus 8 in my tank bag. I really wish the Givi rack fit so I could do the 30L aluminum side panniers, along with a 30L matching rear top case for 90L of space (not to mention more seat space). I find 76L a little tight for multi-day trips. Here is my current setup:
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