I agree the purpose of the trip is irrelevant, I was just stating my opinion.
However, as a result of the ValueJet incident - or if you prefer crash, O2 canisters cannot be carried in the belly of passenger aircraft (or in KLM's case in the hold of one of their combies). While this may have been a knee-jerk reaction at the time, it is now part of the ICAO/IATA Dangerous Goods Regulations. This alone add significant costs to the process, particularly in a market like the ABC islands where there are few freighters flying to Europe. That was my point. The costs are not insignificant.
Having O2 canisters in place for the four airports in question (or five) is a logistical nightmare.
I am glad that your company is prepared to absorb these costs, but obviously not all companies are that generous.