Er, well all you need is an airline rep or TA who can hold reservations for you. You could make a reservation on a JL D class flight as part of an itinerary right now - it's only ticketing it as a OWE that you couldn't do. It is a fundamental point that people seem to fail to get that reservations and ticketing are seperate things. The only problem you have to manage is the ability to hold reservations without a ticket number applied to them.