I've just replaced the fuel lines on my 91 Trident with 8mm (ie 5/16") ID automotive fuel hose from a car parts dealer.. £5 for 50cm, but you can get it on ebay for £1.80/metre. Tight fit onto the petcock because of the thick walls on automotive hose.
Can you just get a length and a T-piece and couple the bike up the the removed tank?
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