With guilty pleas already entered on the remaining charges, including the ones amended in this week's hearing, Keenan would be sentenced in May on the charges, which total $486,045.71.
Judge Hikaka ordered a pre-sentence report to be completed beforehand, advising Keenan the report would include options for community and home detention but this was not a guarantee of the outcome.
Keenan was formerly the chief executive of the Ngāti Te Whiti Whenua Topu Trust, which was formed through the amalgamation of the Bayly Rd and Puke Ariki trusts.
He had been a police officer for 21 years, prior to leaving the service in 2011.
Keenan was project manager for a $4.5 million marae build for the Ngāti Te Whiti Whenua Topu Trust until the project was scrapped in 2017.
At the time, the hapu said the project was cancelled because of missing money.
Keenan is due to be sentenced on May 29.