Why go thru such Goldbergian process to discredit some politician. It's overly complicated. The result of this kind of alleged "framing" isn't even guaranteed -see Berlusconi.
If we believe his claims, his systems had been infiltrated. So why not take advantage of that?
Instead hope he finds the maid desirable (he so much agrees there was sex), hope the maid is believed and there isn't a delay in her reporting the crime and the crime being reported (forwarded to police), hope DSK does not get on the plane on time (hope he keeps his lunch appointment, hope the police do not defer to an IMF bank head, etc. It's really flimsy supposition.
It's not as though it was long term "grooming". It was very spontaneous kind of arrangement. How can any one find this probable? It's just very unlikely.
Planting banking scheme, fraud, etc. document would be another angle. Not quite as likely to grab international attention as a hotel rape, though. Sex scandals are news gold.
Whether the maid had a long-term or short-term relationship with her handler, who knows.
You choose to think it's in the realm of likely probability -we differ.
Scandal? Get some composite pictures of him on his Ipad whatever, of him having sex with dogs and Eastern European white-slave hookers. Do it in Paris.
So if this is a predictable result of this sort of scenario, why is it "the whole series of events ending in framing ... was improbable"?