While I have nothing to offer for the rest of your post,

The pass-through methods are unlikely to be updated regularly… is there an automagical way to maintain these safely?

I can answer: Yes. Class::MethodMaker supports creating forward methods. This makes your methods for forwarding be one line in a use Class::MethodMaker scenario, as in 

use Class::MethodMaker get_set => [ qw/uri/],
                       forward => [ uri => [qw/param field validate/]]
+;

[download]

where param field and validate are all forwarded methods that you want.

Hope this helps

In reply to Re: URI Inheritence by Tuppence
in thread URI Inheritence by gdearing

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