Would be interesting to read a story in which the wild wizard managed to turn into high wizardry. Presumably to get more predictable results, and to be able to train others, and perhaps to get more respect. . . .
It would have to dig deeper into the principles. Perhaps even a transition from the physical to the metaphysical. And be carefully set so that an interesting portion of it can be done in the course of a story. And carefully delineate the high and wild wizardry. If the character is just becoming another high wizard, that's not the same as bringing a different school of high wizardry. (Or, of course, this could be the first high wizard ever.)
But it would be fun.