> Is there another property that could be substituted instead on Wikidata?

Unfortunately no.

> the categories seemed so logical. 

It IS logical to use an existing category for this purpose.

But the WD community has rejected my proposal https://www.wikidata.org/wiki/Wikidata:Property_proposal/Archive/30#category (and the previous one “useful for / interesting to”) because:

- categories are a bit messy, since many people use them for various purposes

- synchronizing cat-item assignments between WD and Wikipedias would be a major hassle.

They even rejected having such property that is NOT synced with Wikipedias, for project purposes like 

yours (Black Lunch Table) and mine (Europeana Food and Drink, European Holocaust Research Infrastructure).

WD does have a bunch of over-specific categories, e.g. “people born/died/buried here”. See

https://tools.wmflabs.org/sqid/#/browse?activepage=1&type=properties&lang=en&propertylabelfilter=category 

Does anyone think we should reopen the discussion for creating props Category and/or InterestingTo?

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