I chose Perl Dojo, but am thinking that it's not strictly speaking a change in metaphor. More a shift from west to east, which may be cheating.

Not so much. A monastery has to do with religion: the actual religion changes across the world and so change the things to be practiced in the corresponding monastery. But a dojo hasn't to do with religion. Well, some japanese martial arts were influenced in some aspect or another by religious concepts in the intentions of their founders: but generally these aspects are not that pervasive. Also the term "dojo" is flexible and adaptable, like Perl itself: it can convey the simple idea of a place were to train and improve one's skills, which is the only thing someone will read in it, or more properly that of a place "where to practice the Way", which hopefully some others will recognize.