The former West Australian wicket-keeper moved back to New Zealand last year, the country of his birth, to try to further his international career and has been playing with Wellington.
He becomes eligible for New Zealand on Sunday, after a four-year stand-down period.
His earliest chance of breaking into the Black Caps will be during England's tour in February and March, but he's putting any assessment of his prospects to one side.
"If you're targeting that sort of stuff, you're not thinking of what you need to be doing for Wellington," he said.
"I've been trying to keep that mindset for the whole season so far, and going forward."
Dannevirke-born Ronchi moved to Western Australia with his family just before his seventh birthday.
In 2008, when Brad Haddin broke a finger, he made his debut for Australia, playing four one-dayers and a Twenty20 international in the West Indies.
But just two more T20s, against South Africa the following January, was to be the extent of his time in green and gold.
Before returning to New Zealand, he had been thinking for a while about having a shot at getting into the Black Caps and it turned out that Wellington needed a keeper.
"In Australia, I wasn't doing as well as I would have liked and there was an opportunity here to have a chance of playing international cricket again," he said.
"That's obviously the goal, to play as high as you can, and that's what I wanted to do."
Ronchi is noted for his slick work behind the stumps, a part of the game in which Black Caps have employed seven players over the past two years.
Wellington coach Jamie Siddons rates the 31-year-old as the best gloveman in the country and someone capable of performing the role in all three formats for New Zealand.
Ronchi has also been handy with the bat for the Firebirds, scoring 111 in his first-class debut for them last season.
In this season's Plunket Shield, he has notched up three centuries in his eight innings and averaged over 70.