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I have repaired many this way, using Pirtek MPH 06 hose. I used to keep the hydro barb at the pipe connection, however they are less secure than a brass 3/8 BSP tail. I drill the 5/8 UNF hydro flare nut to 13mm to fit the tail.
I used to get Pirtek to crimp the hoses, but now use 2 Oetiker circle clamps each end.
I tap the bag 1/8 BSP x 3/8" deep, and fit a SS nipple and 1/8 x 3/8 reducing bush, Loctite 262 the fittings. Hose has a 3/8 dia x 3/8 BSP brass nut and tail. I have also used 3/8 dia x 1/4 BSP nut and tail.
Old bags that have dried out over the years are less successful, some crack through the rubber cone at the top. Bags should be stored with glycol antifreeze in them.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.