The governing body argued that 2015, Olympic qualifying year, was too important to have someone training away from the team.
They were also concerned it would create an awkward precedent, especially with athletes such as double sculling world champions Fiona Bourke and Zoe Stevenson capable of staking their own claim to the boat. Nine single sculling spots can be qualified at the 2015 world championships in France.
Twigg will receive no government funding until she rejoins the sport's centralised programme at Lake Karapiro. She knew the chances of her plan being accepted were limited as she embarked on a journey which, at best, will see her a pioneer or, at worst, a martyr.
In 2013, Twigg was coaxed back into the single after making some training trade-offs, such as more cycling and high-intensity work to create variety in her regime.
She hopes her subsequent training data will provide RNZ with a compelling reason to select her to qualify the Olympic boat at next year's worlds.
A more realistic option is someone else will qualify the boat before trialling against Twigg the following March in a re-enactment of the 2008 Drysdale-Rob Waddell duel before the Beijing Games.