I did the same analysis, I was warned off buying the larger replacement fuel tanks by the UK agent as he said they expand and crack, I looked at the separate tank which replaces one exhaust and costed the whole deal at just shy of 1000 GBP for an additional 9 litres. In the end I went for Rotopax 4 litre cans mounted on the rear of each hard pannier, with lockable handles. They give me an extra 9 litres, so 26 litres in all. At 15km per litre that gives about 400km. The only downside is you have to stop to refill, but a stop every 200 km is going to be more than welcome!
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