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Fortunately the iOS-version absence was only temporary. A few days ago my friend Marco let me know that the Williams pinballs were available through a separate application named, quite predictably, Williams Pinball.
I downloaded the app and installed it on my iPad. Unfortunately it's a bummer. I am not talking about physics or graphics. Those are excellent as is always the case for Zen pinballs. The problem in the case of the Williams app is that it came overburdened with all kind of customisation stuff, which are in fact a not-so-subtle way to push in-app purchases. I would have preferred, and by far, a situation identical to the one on the Mac: you buy each table and that's it. I would even have been read to purchase the same tables a second time. As things stand now, I seriously doubt I'm going to do this.