Can the infinitive article "a" be added before uncountable nouns? What a plenant shade these trees give us?

Can the infinitive article "a" be added before uncountable nouns? What a plenant shade these trees give us?

In this case, shade as a countable noun, just like a fire, means a fire, but fire only as a fire is not countable, "a" is a definite article, the is an indefinite article, which has nothing to do with "a" is a definite article

So Adjective + indefinite article + noun

So clear a student must have an indefinite article. Uncountable nouns cannot be used in this way

When can the article a be added before the structure of "Adjective + uncountable noun"?
When can't it be? Or isn't it?
English grammar

Some uncountable nouns can be modified by adjectives with indefinite articles, such as: a mild climate, a good knowledge, a big super, a fast lunch, etc