Not sure if this would work, but could you open a NS&I direct saver or investment account? As an expat you are allowed to. You will get a sort code and account number (generic NS&I) and a ref number - maybe DWP can pay payments into one of these? I believe you can xfer cash from your NS&I account to overseas bank accounts.
You need a UK current account in order to hold an NS&I account.
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