The critically panned film, which has been described as "the naffest royal movie ever", is due to screen here on TV1 the night after the royal wedding in London.
Evers-Swindell's acting in the film has been described as so wooden to be "teak-like", but he is shrugging off the criticism.
"There's a good reason I'm not reading the reviews. You're dealing with the golden boy and golden girl of Britain right now," he told the Hollywood Reporter.
"This isn't 'The King's Speech' (the Oscar-winning film about King George VI). This isn't an in-depth look at the royal family."
The Queenstown-born 31-year-old questioned what anyone could have expected, given the film was developed over 30 days by "a network that's known for romance".
"It was always intended to be a fun ride, a light romance, a love story at the heart, and just a jolly good time," he said.
Evers-Swindell, a cousin of Olympic rowing champions Georgina and Caroline Evers-Swindell, said shooting the film was a race against the clock from the start.
He had less than a week to research the part and had to shoot for up to 15 hours a day with minimal takes - but that was "the nature of the beast" when shooting made-for-TV movies.
"For my first lead role, it was an incredible learning experience."
Evers-Swindell stars alongside another unknown actor, Briton Camilla Luddington, 27, who plays William's bride-to-be Kate Middleton.
'The Guardian' reviewer Stephen Bates said the $US10 million ($NZ12.5 million) film was "toe-curlingly, teeth-furringly, pillow-bitingly ghastly" - but added it was so bad it would "probably be a smash".
'William and Kate' screens on TV1 at 8.30pm, Saturday, April 30.
