If he was cleared before the 2017 election, he would consider returning to the party as a candidate, "if they will have me".
Mr Craig stepped down in June amid allegations that he had harassed his former press secretary Rachael MacGregor.
That prompted the board to collapse. It also led to a messy war of words between Mr Craig and former board member John Stringer, who made the complaint to police about the Conservatives' election spending.
Mr Craig and Mr Stringer are also suing each other for defamation. Mr Craig is also seeking defamation damages from blogger Cameron Slater and lawyer Jordan Williams in relation to their alleged role in in the collapse of the party earlier this year.
Board member Leighton Baker thanked Mr Craig for his leadership, saying the party's rise from nothing to 5th largest party in New Zealand was "largely due to Mr Craig's enthusiasm and support".