That man needs 6 canes on his buttocks, plus a whole week of cleaning streets. Only such 'childish' punishment can drive some sense to his 'childish' brain.
There is more to bringing up a child than flashing cash around. Does he even care about that child really, or he is in this for his ego?
Taking that girl to a different school from the other kids, buying her expensive gadgets, cloths and whatever else just puts her into a collision course with the other kids. The kind of mental torture those other kids might put her through just because of such treatment would lender her mental status completely messed up and not even Makini or Riara would correct the damage.
You can imagine these kids deciding they wont talk or play with her simply because she is the special one(remember watoto ni watoto and such treatment is not far fetched. It even happens to real brothers and sisters, sembuse huyu wa 'nje'). The father-daughter visits going forward would mean he would be spending time wiping her tears as she narrates to him how she is hated by the other children. I wonder whether that would make him love her more.
Further, the mere reason of showing that girl she is more privileged/superior than/to the other kids is in itself immoral. That is not how to bring up kids. You should not implant 'classes' to such kids at their age. As much as humanly possible, children should know all kids are equal. They are supposed to be taught how to share whatever much or little they have, not to have mobile phones while their siblings cant afford them. This man is trying to sow seeds in her that he might live to regret.
One more fact is that as long us that girl is living a generally good/decent life, she is safer with the mother than with a step mother. Majority of children raised by step mothers will give hallowing stories of the kind of things they were taken through by their step mothers. Now why would this man want such a life for his daughter who he allegedly loves yet her real mum is still alive? Do you know how much many children would pay just to be with their mums regardless of how rich or poor their mums are?
Finally, the court is just a bigger torture for the kid. The easiest would be to sit down as adults and agree maturely how to handle the situation going forward, and he shouldn't go there with his big ego. Honestly, he is being done a favor. He has a right to see his child, but the child's mental well-being should be more superior a consideration that his mental well-being. I am sure he can handle not seeing the daughter every day easier than the girl can handle the kind of ridicule he is about to put her through.
Actually if he wants a kind of happy life for the girl, he may consider supporting her education in the school her current parents chose, as long us its decent. He might even consider going the extra mile and treating all the children when he decides to so that his daughter will never grow an evil ego like his. Kama ni nguo, si anunulie tu wote and his girl will be dressed decently as he wishes and the other kids will not feel left out. When they are of age and able to understand, they shall chose what to do with their lives. As much he has a right to his daughter, he should, as a parent, also consider what picture he will paint to the other children.
The other man also have a responsibility to protect the other children from 'ridicule' from this one girl. Imagine her bragging to them all the time the way their school is big, has this and that and they are there asking their dad why he takes the other girl to a different school and them to a bad school. How do you answer that as a man? How do you start explaining to the other kids that its the other dad who pays for the older girl, but me as your dad I cant afford what the other dad does. How can that even work. What kind of a family would survive that way. Its usually hard for a man to explain why he can't buy his kids what their neighbors have, imagine now explaining this situation to these dot.com kids.
Money should not be a substitute to common-sense.