Other than the Warrior of Light, White mages are limited to the Padjals, or if you were somehow able to find some soul stones from Amdapor that hasn't been hidden by the elementals.

In the end of Endwalker's ranged physical role questline　
Gosetsu takes up shugendo, which could be similar to conjury; however, real-life practitioners of shugendo are called yamabushi, or mountain hermits.
So this might not work well if your character is part of Sui-no-Sato's close-knit community.

In addition to the parts of life that has been described about Sui-no-Sato itself, your character might also pick up skills, originating from surrounding cultures - the Ruby Sea, Hingashi, or Doma, or one from the real-world practices that inspired them - either through the Kojin, or preserved in Sui-no-Sato after they have closed off from the outside world. One example would be onmyodo.