It was Karl Höller's 1st I thought of. And you are right about Rubbra's Finale. The difference to Bruckner is, that Rubbra planed the Lento of his 1st as a last movement, Bruckner didn't that with his Adagio. The more I listen to Bruckner's 9th, I find the thesis of the "finished unfinished" symphony less convincing. For my ears this adagio is more or less a great prelude to the finale. Rubbra and Enescu make sure that their slow movements are the Finali of their works, when they gave them indications of finality, Enescu with the choir, Rubbra with the sublime crescendo-accelerando-fugue. And even Höller, whose 1st isn't realy a "Finalsymphonie" like Rubbra's or Enescu's, goes in that direction. His Adagio-coda is much longer than Bruckner's and the climax is in the center of the movement.