It's likely the trial could last 3-4 weeks, the court has earlier heard.
Justice Cameron Mander remanded Wright-Meldrum and Hawken both on bail to a pre-trial callover hearing on February 26.
Blackmoore was 10 weeks pregnant when she was bludgeoned and stabbed to death while her 2-year-old son Dillon slept in the next room.
Last year, 45-year-old Jeremy Powell was charged with carrying out a contract killing.
In June this year, Powell, who claimed he was paid $10,000 to kill Blackmoore, was sentenced at the High Court in Christchurch to life imprisonment with a minimum non-parole period of 10 years.