An LVQ to hold all the reference data is a really good idea, if the data is small enough (as you mentioned). Or possibly a couple different LVQs, with the data sharded across them as appropriate.
For much larger applications, I have seen SolCache (now PubSub+ Cache) used to hold all the reference data, getting rehydrated once a day or once a week as required. That said, for this very simple straightforward map lookup, Hazelcast seems like a good fit…? But if trying to simplify the number of different types of components (and you already have Solace Cache) then that could definitely be fine to use.