I think it is correct to say, “But to us, A, B, C are of interest”.
“But to us, A, B and C are of interest”.
But is it correct to say, “But to us, are of interest A, B, C”?
“But to us, of interest are A, B and C.”
While speaking we can make the communication clear to the listener by using a pause or a stress or a gesture. Even the tone/intonation will be of great help. But while writing, it’s always safer and better to adopt the straight sentence, unless it is otherwise contextually warranted.