I tried, but without success.
VS does have a hook to specify where the item/project templates are located, but this information is in the registry, cannot be provided dinamically in a dynamically-generated pkgdef (i.e. automatically everytime you open a solution, to change the location
accordingly), and is statically merged/cached when VS loads up (as all other pkgdefs) :(
Daniel Cazzulino | Developer Lead | MS MVP | Clarius Consulting | +1 425.329.3471