I remember calling BCN to request something from Keping the Summer Alive and being told no way.
And rightfully so!

Maybe not; Oh, Darlin', Santa Ana Winds and Endless Harmony might have fit nicely in their format. By 1980 they were getting a little "pseudo-intellectual" - I'm not surprised your request got "Shut Down!"

It shows they didn't have an open mind and says more about them, than you.
By then some of them were getting to be old geezers.

Endless Harmony was the perfectly missed "teaching opportunity" to reintroduce "You Still Believe in Me" and Pet Sounds via the ending measures of EH, and show the connection as between the two, and, by that time, "history" of the music. Fools.
All this talk about Sunflower had been interesting enough to take a look-and-listen back...I've enjoyed it, thanks, to the original poster, (Sunflower-not a song title, perhaps but a then-timely concept.) They might just as easily have entitled the LP - "Our Sweet Love" because the overriding song themes are about love; "sweet" love, and "not-so- sweet heartbreak" love, and "can we rekindle that lost?" love. And, I think it would have made a great "anchor" single Side A, with Add Some Music, as Side B. Maybe the record company was greedy, and was "holding on reserve" for later release as 45's, some of this great material?