We're peers so I know what you mean. On the other hand, I realize that what we do will never end anyway and therefore I don't think about reaching the end goal. When I started digitizing the parish registers of the area where I live a little more than 10 years ago, after 4 heart attacks, I never thought about completing it. Now that it is almost ready until about 1820 (the time when the registry office is reasonably complete and effective), I am planning to start indexing the notary protocols. I made a rough calculation about how long it will take to index all 6438 protocols that are in the Reggio Calabria state archives and I arrived at approximately 160 years (if no one come in to help me). However, I will not be discouraged by that. But to the point.
In my index of the year 1817 I mention the parish where the marriage took place. If the relevant register still exists, you can find the marriage in the index at the relevant parish at
http://www.benvanrijswijk.com/fontigenealogiche.htm. On the website of the diocese of Reggio Calabria and Bova
http://www.archiviodiocesanoreggiobova. ... rocchiali/ you can find the photo of the corresponding deed. The deed can be difficult to read, that was one of the reasons for making the indexes, but nothing else can be done about it and yes the content is very often not as complete as that of civil status certificates.
I know that the situation in Sicily (especially Messina) is not that easy. Apart from the registers of one parish, everything is still in the parishes there. Actually like the situation in Reggio Calabria was before I started there. In the meantime the situation has completely changed with us and most parishes have donated their registers to the archive, mainly thanks to our hyper active and always restless director Pia Mazzitelli. In Messina someone like her and my little person is needed to go to all the parishes and to fotograph everything there is and to persuade the pastors to donate their registers to the archive. Unfortunately I cannot do that (then I have to sail to Messina every time and I cannot do that. I have a wife too, you know) but who knows someone will do that in the future.
I sympathize with the problems you are experiencing.