Xavier Raabe-Manupule played him as a child in the
Season 5 Episode "He's Our You".
Cas Anvar portrayed Omer in the Season 6 episode "Sundown".
I have written to Mr. Anvar, requesting an autograph.
I'll update this post if/when I receive a response.
I haven't been able to locate an address for Xavier Raabe-Manupule