Flyinghigh66,
I think the reason for some of the abuse that you may be getting is that you appear to be asking about working for nothing. Most aid work is done by commercial organisations such as Airserv, or groups such as MAF who whilst not paid in the manner that commercial operations might recognise are very carefully selected non the less.
Many years ago I spent a year or so doing this type of flying in New Guinea. We got paid for doing it, not very much, but they required a minimum of 1000 hours and tailwheel experience before they would take people on, and with good reason. Flying single engine aircraft at high density altitudes onto short strips, often with 20% slopes (that isn't a typo), in mountains that make a lot of the Alps look like pimples, is not the place for a frozen ATPL who has been flying Senecas around Oxfordshire (and I apologise if you are not in that class).
Now that I fly airliners for a living from the LHS I would say that with 250 hours you are safer in the RHS of a 737 or an Airbus than you would be in some bush operations. In an airliner you learn your trade before you move to the LHS and have to start making the decisions unaided, in single crew operations and especially in remote areas and difficult terrain you have to start making them from the first day without an experienced pilot next to you to guide you.