Change Namibia's speed to 1 on all 15 starting players, change all New Zealands starting players speed to 99. Pick international test and play as NZ vs Namibia. Now I have 2 solutions! 1. For those that cant ruck or maul then simply keep scoring! 2. Rather than keep scoring and scoring, run the clock down after your first try/drop goal/penalty goal. Just take it into contact and from the resultant ruck press either LT or RT to offload to a forward, taking it into contact again either side of the previous ruck/maul. Namibia are that bad without lowering their stats you shouldn't have an issue, just to be safe though in case you accidentally go mental with A and concede a penalty make sure you're camped inbetween their 22 and halfway.