Very weird fix create a mouse over macro “/use [@mousover] Ancient Memories” and go to the dragon riding mount editor Rostrum of Transformation with your crafting partner (or self). Right click to enter the mount editor, exit the screen, mouse over the intended target and use the macro.
Something about switching from that menu screen to regular ui makes the item useable temporarily. When we did it the jewelcrafter/blacksmith was able to make both items with 1 cast. Hopefully this helps someone else!