Not sure if this is the ideal solution but I'd say try an application of something like Rain-X in the UNswept part of the screen to keep it permanently clear of raindrops.
It is strange that only the 206 had this problem - the 205, 207 and IIRC 208 have "normal" wiper set-ups - which I imagine is to do with the design of the bulkhead and difficulty in swapping everything over for RHD. As with BMW 5s there is an additional linkage to the dirver´s side wiper to "flick" the wiper up into the corner, so the problem is not as bad as it could be.
Go back a generation and all manner of cars imported from the continent had "unconverted" wiper patterns - nearly all Peugeots, Renault 12s and 16s; most VWs and Audis from the 80s (strangely, South African models had a locally-adapted proper RHD set-up, so that was obviously penny-pinching.)
The biggest offenders of "mis-wiping" were undoubtedly British Leyland (Marina/Ital and Triumphs BAD; 1100/1300/1800/Maxi/Mini GOOD; Rover P5, XJ6, MGs WEIRD) who even swapped the wipers over for export markets, so that they were the wrong way round there, too! A press release I remember coming across in a motoring mag of the 70s mentioned something about avoiding wiper lift-off at high speed. Early Marinas had RHD wipers but were later changed over. Belting down a rainy M1 in a Marina - what an exciting prospect! "Young drivers today don't know they're born..." etc.
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