Tainui chairperson Tukoroirangi Morgan believes iwi are unlikely to accept a one size fits all solution to recognising rights over the foreshore and seabed.
Iwi leaders met in Rotorua on Tuesday to approve a consultation plan to develop an alternative to convince the Government to repeal the contentious Act.
They also agreed any changes should not affect settlements negotiated under the Act by coastal iwi such as Ngati Porou and Te Whanau a Apanui.
Mr Morgan told Waatea News he doesn't believe there is a simple solution.
"There will never be another settlement like the fisheries settlement where there was a collective settlement for all, and they used a one size fits all kaupapa and framework.
"That's a model that ... iwi around the country aren't comfortable about, because it doesn't catch its uniqueness region by region, iwi by iwi, and so we have to be innovative about how we do this."
He says the iwi leaders will aim to complete their consultation by April, when a national hui will be held at Turangawaewae Marae in Ngaruawahia.