docbook-xsl URL mess

In docbook-xsl 1.79.2, the system identifier was changed from

     http://docbook.sourceforge.net/release/xsl/current/...

to

     http://cdn.docbook.org/release/xsl/current/...

However, this was done in a backward-incompatible way.  So now, in your 
customization layer or build system, you have to pick one of these URLs, 
and users who have a different docbook-xsl version installed locally 
will suffer, either because the stylesheets have to be fetched from a 
remote server, or the build will fail entirely.

This didn't use to be a real problem in practice because 1.79.2 saw very 
little adoption, but it's now trickling into various distributions and 
packagings, and it's becoming a real source of frequent build problems.

This should be fixed by making the supplied catalog files include 
backward-compatible mappings.  However, it seems after 1.79.2, 
docbook-xsl went unmaintained, so we are now stuck in this limbo.

Is anybody in a position to get this fixed and get a new patch release 
out soon please?