Rietfontein gravel up to WHK if you want, otherwise gravel to KMHP and then tar to WHK.
WHK - Outjo tar via Otjiwarongo is 320km, partly gravel via Omaruru about the same.
Outjo is not the same as you remember it Chris.
I were born in Outjo, first 10 years of my childhood in Welwitschia/Khorixas.