Millar, who has trained under Paul Gamble at AUT Millennium for the past 10 months, left his club singlet in Tauranga and officials would not allow him to race without it.
"I guess they were just looking for excuses to make it difficult, I'm not sure why, I guess it was an ego-trip kind of thing," Millar said.
He believes getting away from the "noise" and potential distractions in New Zealand will give him the best chance of qualifying.
Millar's mission is being funded by the Bobby Stafford-Bush Foundation, a charitable trust set up in 2013 to support young people and community groups who have a goal which may be unobtainable without financial assistance.
"If I didn't get this grant I would have tried to gather up some money to pop over to Australia and give it a go, but this is a much better opportunity and will give me the best possible chance of qualifying."
While Millar will be throwing everything at qualifying for Rio, he doesn't believe the trip will be a failure if he doesn't make the grade for this year's Games. "Even if I don't qualify, the things that I should pick up just from training around athletes of that calibre will make me a better athlete in the future," he said.
"The guys there are all really fast, some of them can run 100m in under 10 seconds, so to be able to train with those guys and see what they do and how they do it should be really good for getting me to the next level."
Millar leaves for the London tomorrow, and will compete in Britain, Belgium and Switzerland.