Can you post a picture or describe the typical new leaf growth of the pluerry? From what I've read the Spice Zee Nectaplum is supposed to have bright red new leaves, which may be helpful to differentiate the two if the flowers don't develop this year.
That's a huge bummer. You've made such an amazing food forest there with a lot of hard work. Happy to help in any way we can, and wishing you good luck on finding a new place to settle in.