Posted below is the current default settings, with the routes MM knows they're used on. It may be easier to spot glaring errors in this list - any feedback welcome
AY's E70 and E90 offer J if flown on a J-route; similarly 319/320/321 do not offer J if flown on Y-only route. (and this even applies to terrible 75Ws and FinnComm's ER4s) All narrow-bodies are in movable curtain configuration, and the classes offer only depend on the route - aircraft has no significance. I'm pretty sure the same is applicable to BA/IB/MA narrow-bodies at least to some extent.