Care and feeding of a long kitchen drain?
Depending upon the location of the kitchen sink with the garbage disposal, you could re-pipe the drain to a dump tank with a "macerator pump" or sewage pump. This would reduce the garbage disposal stuff to an almost liquid state, thus reducing the chance for a clog further down the drain. Our worst waste product that always plugged our drains were lettuce leaves or any leaf products. This may not be the answer you are looking for but it would be a solution.