Is C1 writing with only A1 speaking possible?

[Theodisce]

George Orwell was of the opinion that French explained why he occasionally put adjectives after the noun (though this can also occur in Polish).

In my opinion it is very unlikely to occur in Polish. It may be found e.g. in Bible translations, but they use archaic constructions as a rule.

I find it very noteworthy that there are people who are able to write good literary prose in a L2. I'm thinking for example about African writers who write in French or English. I authored some scholarly texts in two foreign languages, but writing belletristic (short stories and novels, not the papers one is required to write while attending a language course) is above my skill level.

[William Camden]

I'll see if I can dig up some Polish examples but I feel that kind of construction is more common in Polish than in, say, Russian.

[William Camden]

http://www.teatrpolski.wroc.pl/

Strona główna (main page) and Teatr Polski.

[tarvos]

Yeah Polish uses that construction more often.

I think prime candidates for this kind of situation would be heritage languages, minority languages or dead languages. I think Latin or Ancient Greek would be good candidates. You can of course speak those (and I know people who do) but there's not really much of an incentive to speak with coffins.