Vf1000r tank issue

Hello all… need some advice please… I have been working on my 1984 VF1000r for over a year now and I’m nearly there on completing it… the last thing I need to do is sort out a rusty fuel tank which I thought wouldn’t be an issue.. so I thought! I have spoken to a tank restoration guy tonight and he said it is near on impossible to apply a liner to the inside of the tank after it’s been acid cleaned because of the valve inside the tank will get blocked during the lining process… has anyone got involved in tank cleaning on this bike and know about this issue… the guy talked about cutting the bottom out of the tank, re-piping and blocking of the main on/off fuel tap and putting an external fuel stop cock on which I’m not the keen on doing.. any suggestions would be mostly appreciated. Thank you Sean