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The approach suggested above is the way to go. However, there are some possible pitfalls to watch out for. For example.

Some routes are notoriously difficult to get availability in the required booking class. These will require flexibility on dates, and may require a change in routing (which incurs change fee) and a change in routing may run into a problem with too many segments (maximum is now 16) causing other changes elsewhere in the itinerary to make it work. If you provide an idea of where you are travelling, we can advise if any of those routes have poor availability.

Some routes are seasonal. Booking a dummy date outside the season for a flight is problematic.