Perhaps the simplest way would be to alias the functions in the Foo namespace:

*transform_one = *Foo::Transforms::transform_one;
*transform_two = *Foo::Transforms::transform_two;
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And then your exports become just:

our @EXPORT_OK = qw(
   transform_one
   transform_two
);
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But then that questions why you've put those functions into a different namespace in the first place?