I tried the obvious ...

:) 1 hour and 49 minutes before your post I posted the solution in Re: removing namespaces with XML::Twig?

Simply use https://metacpan.org/module/XML::Twig#set_tag-tag-

In reply to Re^2: removing namespaces with XML::Twig? by Anonymous Monk
in thread removing namespaces with XML::Twig? by Anonymous Monk

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