Hi,
Interesting idea, and I do not know the answer, but can think of a couple of things to consider.
The original Tenere had a 28l tank, which was reduced to your 23l mainly through moving the air filter under the tank. The tank sides were also increased to get it up to 23l and I believe your bike already has a fuel pump to get at the last few litres.
The 1VJ tank did lead to problems, one of which appears to have been overheating, so making the tank larger through extending the sides could increase this overheating risk.
My gut feel is that unless your metalwork friend can work wonders, is that it may be best to carry top-up cans as luggage.
I am sorry that I cannot offer a solution, but perhaps my reply will help give you a couple ideas to check out any potential solutions?
Best regards
Geoff
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