If you can find a tuner who can confidently tune the AdBlue functionality out of the ECU, then the Adblue system fitted to your car will effectively be redundant. So then you can either drain the AdBlue tank or let it leak until its empty.
And if you feel the need to replace the current leaking AdBlue line, I would look at fitting a better quality product that wont fail again in a few years time.
Anyway, have a chat to a few different tuning places in the Sydney area and see what they have to say. They might have some tricks or other methods to get around the issue based off experience they have had with other customers cars.
2017 Ford Fiesta ST
2015 Audi SQ5 bi-turbo V6 TDI family hauler
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