Ah, so instead of

with 'MooseX::Traits';
has '+_trait_namespace' => ( default => 'Another' );
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you would write

with 'MooseX::Traits' => { 'trait_namespace' => 'Another' };
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That could store the string in lexical variable that the instantiated role's code blocks are closed over, so it knows the value you told it. ((I'm borrowing the terminology from C++ templates: instantiate means to spit out a real type from a template))

That certainly is more to think about.