I'm no MPA specialist at all, but it strikes me that a better approach would be rather than spending money, for an indefinite period, to send guys overseas to retain/learn MPA skills we should wait until our replacement MPA has been selected and due for arrival, and then pay foreign experts to come to Uk to set up our OCU. We could hire in current foreign serving personnel or recently retired guys as contractors.
That way you are only paying for what you need. You could also have some RN experts and ex-nimrod guys as observers/advisors within the OCU just to make sure that any specific old Uk lessons lerned in the past were retained or included within Trg.