I think Kiah will be used on offense in much the same way as Tina Charles was used, especially before her senior year. She rarely came higher than 7-8 feet from the basket, and "flashed" across the lane repeatedly to face the ball, often occupying "one and a half" defenders. She was an effective screener, but she didn't do ball screens near the 3-point line; she sealed off one side of the lane to allow guards to drive through the other side.
I agree that Kiah can get at least 10 points a game (playing 30 minutes) just through "garbage collection" -- putbacks and layups when the defense gets preoccupied with other threats -- and also running the floor in transition. (I remember CD saying that Kiah can "run like a deer", something that would never be said about Stef.) I think she can have a number of 15 and 20-point games, even against good competition, just by scoring in these ways. And I think she can hold any other center in the country (including EW, Harrison, and Coates) well below their average in points.
I think passing and decision-making in the offense will be left to others, as it was with Tina. Geno certainly knew how to make the offense work with Tina doing just what I've suggested for Kiah. It's different, but not necessarily less efficient, than what he did with Stef.