I believe the only way would be if they are licensed by OFAC. Are you sure that they are actually Cuban nationals or are they just of Cuban origin but are either citizens or perm residents? I find it odd that you would have such a large population of actual Cuban nationals...but I guess anything is possible especially if they found a bank that was willing and able to open their accounts LOL
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"Never allow someone to be your priority while allowing yourself to be their option!"