Here is just one opinion and I am not sure if it is helpful to you or not but here it goes.
In that situation, I would see if the child would be willing to read the applicable math books over the summer (sort of a gifted self-study math summer program or you could use a course, an online course or a tutor.)
If your child has no interest, you may have to let it go. The consolation is that the gifted students who picks of those books later in their life will get up to speed on the topics very quickly and will access that information when they want / need it.
As far as I know, you cannot get a gifted / highly gifted person to do anything unless they want to or are at least willing.
So, look at it analytically and if your child states later in life, "Why didn't you make me do it?" explain that it was not possible. Gifted people are very strong-willed and independent and intense in our experience.
