Hi Neville,
It would help to see the original
spreadsheet to see exactly what we are dealing with.
For the Wikipedia part, I'm not entirely sure (I'm not a specialist of the templates on en.wp ).
For Wikidata, OpenRefine[1] is probably the best tool. Here I know this tool and I can probably help (or maybe even do it for you, depending on the work and available time).
Plus, I see there is a NICPMI identifier in Wikidata which will help a lot (to spot duplicates - because it's not just a bulk transfer as you don't want to import what is already in Wikidata ;) - and to align/augment data), I hope this identifier is in your spreadsheet too.
PS: maybe we can continue in private or in a small group if other people are interested (either to help for Malta or in a similar situation in an other country).
Cheers,
~nicolas