This was a brave post to write and a hard post to read. I congratulate you. I'm not sure where, in Namibia you are, but you may want to consider contacting the Windhoek Waldorf school and asking for a teacher - Cony - who works with the younger children. I know her from McGregor where she lived for many years. She may have some thoughts/advice for you.
I have also selected this as today's #daily-nominated post in the #teamsouthafrica Discord channel.
I wish you, your husband and your son everything of the best in this hard journey.
RE: The Gifted Child: Our son is gifted but not surviving in school :-(