Setting custom Glib::Property values in Gtk::Builder .ui XML

Short of having to write an underlying class in C, is there any way to have
custom derived widgets with custom Glib::Property, and set those custom
properties through a Gtk::Builder .ui?

Presuming the answer is no, because the properties are only registered with
GType when the instance is constructed - not when the class is constructed,
which GtkBuilder won't do anyway if it's C++ - is there any way this could
possibly work in future, or discussion I can read?

Basically, I'd like to move a tonne of code that does widget packing and
property-setting out of .cpp files into .ui files, but it doesn't really
seem worth doing if the added properties of my custom widgets would all
need set/get through .cpp files still. I'd like to move everything that
could be expressed statically/declaratively to .ui files, or nothing. I
don't think moving only the base Widget bits to .ui but having to keep the
rest in .cpp is better overall, but worse.

So far I can derive a subclass of e.g. Gtk::Button, add whatever
Glib::Property, and see/change its value in the GTK Inspector. Even this
isn't very well documented; it doesn't seem to be included in the main
gtkmm doc book at all, for instance, so we might want to fix that.

Anyway, this registers properties per-instance when the C++ constructor is
called, so GtkBuilder doesn't actually apply the values of custom
properties, and the GTK Inspector gives warnings about invalid property IDs
when you try to check/change customer properties in a .ui

I'm guessing this has been discussed and just can't be done, but I'd just
like to check anyway.

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