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I like PJE's approach, and the patch works for me.
About the only thing I'd change is to switch the expression in
PyImport_GetImporter to a simple chain of if-statements in order to:
 - silence the warning from GCC about an unused value
 - make it more obvious to a reader what the function is doing
An optimising compiler is going to produce similar code either way, and
it took me a moment to realise that the && operations are being used
purely for their short-circuiting effect, even though there is no real
advantage to using an expression instead of a statement at that point in
the code.
Adding a simple test of the functionality to test_cmd_line would also be
good.