I think hiring them is best in the short term and passing on all his knowledge to fanciers that want involved, if you have a liberation in your area get your club secretary to write to the local falconer to come along before the liberation, although I can see contingency plans needed for late libs and holdovers
Hiring one to fly his bird in an area of high hawk population would also be a possibility
A pilot scheme somewhere in the UK for a fancier to home, care breed and train birds for the above, ideal person would have space and time also interested in both Hawks and pigeons :-/