Sure you can't just squish some bags on under the seat? I used to manage it (two half full panniers) to go swimming with MiniGB:
http://www.greenbank.org/misc/IMG_4591_medium.jpg
The seat attaches to the top rails of the rack so can't access them to clip a bag too, so I would need a new rack with secondary rails - this is maybe where the bodge option comes in to play .
Tubus Logo is a nice rack.
@Samson started
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Sure you can't just squish some bags on under the seat? I used to manage it (two half full panniers) to go swimming with MiniGB:
http://www.greenbank.org/misc/IMG_4591_medium.jpg