The United States Department of Interior had control over immigration flows to US territories (the State Department was in charge of immigration to the US proper).
Harold Ickes, the Interior Secretary, was the individual who OTL pushed for the settlement of Jews in Alaska. What if Ickes, in conjunction with American and international Jewish organizations, organized large-scale German Jewish immigration to US territories on the basis that such migrants were not allowed to relocate to US states (placating domestic xenophobes and anti-semites)? Funding for the program would be entirely out of existing interior department funds and NGOs.
The specific listed territories would be
- Alaska
- Hawaii
- Guam
- American Samoa
- United States Virgin Islands
- Panama Canal Zone*
- Puerto Rico
- Philippines*
I'm not sure if the Interior Department had a say on immigration to the Philippines during the Commonwealth Period. Laws passed by the legislature affecting immigration, foreign trade, and the currency system had to be approved by the United States president.
I'm not sure the Panama Canal Zone was under the supervision of the Interior Department.
Also of note are that the Dutch had no immigration controls on their Caribbean territories (see
here) and the Dominicans were willing to take in up to 100,000 Jews.