Sir Grant said the changes would increase efficiency in the courts, because juries would not have to wait while lawyers fought over whether evidence was admissible. It would also ease the stress on complainants.
"It's always going to be a ghastly, stressful experience but ... this will reduce the stress in part," he said.
A spokeswoman for Justice Minister Judith Collins said it was too early to say whether the change would be implemented.
The recommendations stemmed from a 2011 research project by Victoria University legal experts Elisabeth McDonald and Yvette Tinsley, which suggested that rape victims be removed from hearings altogether.
"We didn't feel we could go that far. At the end of the day, the complainant's got to be prepared to come into the witness box and say, 'That's him and this is what he did'," Sir Grant said.
Green Party women's affairs spokeswoman Jan Logie said the changes alone would not radically improve the courts for victims, and called on Ms Collins to restart work on alternative processes.
A proposal to get rid of jurors for sensitive cases involving children or sexual assault victims was shelved by Ms Collins last year.