The adventure to coincide with this year's Anzac Day had been aimed at helping farmers and veterans enduring mental health struggles.

Organiser Alex Wolf, a welfare advocate at Wodonga's Hume Veterans' Information Centre, said while the travel firm deferred the trek, there were a few now not going.

"We would like a refund for some of our people who can't go or have a situation where they would prefer to spend the money somewhere else," Mr Wolf said.

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"The refund might allow them to get through this virus because a holiday or trek has lost its importance to a couple of people."

Mr Wolf wrote to Adventure Kokoda founder Charlie Lynn and manager Tracie Watson stressing the charitable aspect of his venture and appealing for full refunds after travel restrictions made it impossible to proceed.

Mr Lynn, who has walked Kokoda 99 times, replied that he appreciated the charitable work of Mr Wolf but a refund was not feasible within 30 days of the trek.

"We are unable to turn-off many of the financial commitments we have made in advance for the successful conduct of our treks within 30 days - these include the purchase of international air fares, charter aircraft and camping gear; the operation of our logistics office and storage facilities in PNG; and our normal business obligations," Mr Lynn wrote.

The Vietnam War veteran told The Border Mail that given the extraordinary situation, deferrals had been granted when normally that would not occur and participants would have to seek a travel insurance payout.

Mr Lynn does not foresee the trail reopening until September and is prepared for all the trekkers booked for this April to come at the same time next year.

Mr Wolf said doubt meant he could not say how many would go, but he personally wants to continue after having done months of training.