Because of missing milestones and the difficulty of creating milestones (the things that allow you to find all the occurrence of and references to a specific paragraph of a specific document), I have suggested Verbum look into using the AAS for "minor" documents. Would this work for you?
There is one solution that is less than ideal but would at least be understandable. For recent documents has anyone looked into using the AAS number as the basis for a datatype? See Acta Apostolicae Sedis - Wikipedia for a description. This would be like tying everything to a Congressional Journal. As the AAS is available online, it would be practical for people to keep a cross-reference of document name/AAS # for those things they use regularly ... in fact, scholars would likely learn their most relevant AAS numbers simply by use.
Edit: I just did a scan 379 resources currently have AAS references.