The question was about double dipping Tele, not whether you can be certified.
1. The initial SS1600 is redundant - meaningless - by definition, because within the same 24 hour window you completed a SS2000K. It is impossible to ride a SS2000K without superseding the SS1600K. I'm calling that one double dipping, but only that one.
2. The SS2000K stands as a great ride - well done.
3. The BB2500K is completely legit, because it is not necessary, by definition, to complete EITHER a SS1600K OR SS2000K when completing a BB2500K. You may, for example, do 1500km in the first 24 hours, then another 1000km in the last 12 hours.
4. The SS2000M/48 is of course legit. What the SS2000M also is, is another ride that makes the initial SS1600K meaningless, because as discussed above a SS2000M cannot be ridden without completing at least one SS1600K - by definition.
To go crazy with this double dipping, you could complete a ride Sydney to Perth (4000km) in say 47 hours, then turn around and complete the return leg (4000km) in 47 hours for a total of 94 hours.
I would call that a 100CCC GOLD.
But you could submit a bunch of SS1600Ks; 2x SS2000K for the over leg and 2x 2000K for the return; throw in a few BB2500Ks - yeah three sounds good - maybe a BB2500K GOLD or two if the conditions are right, then again a couple of BB1500M GOLDSs if the fuel stops weren't quite right - what the hell, submit both kinds; 2 x 50CC; a couple of SS3000Ks; SS4000K - hold on, make that 2 of those; a SS6000K; SS8000K; hang on, lets get back to imperial with a SS4000Mile ; SS5000Mile; another handful of SS1000MILES; 2x SS2000MILES. Oops, I forgot a couple SS3000K GOLDs, lets say 2 of those and also a couple of SS4000K GOLDS.
I would just call that ride a 100CCC GOLD.
Edit: I have double dipped, but not by definition, on special rides eg Centreline 24 completed within a 50CC North/South. Or the first ever SS3000K GOLD nested within a SS3000M.
However, I once completed a long ride called the Australia Southern Cross.Nested within it, but left unsubmitted were a couple of 50CCs, a Trans Australia, maybe four SS2000s, 8 x SS1600s, a BB2500K or 2 or 3, maybe 5 because I deemed them double dipping.