I am emphatic about creating *authentic* hoodoo formulas in the Southern rural-style tradition, and when I come up with a new hoodoo formula (as with Kaliprix) or create something outside of the hoodoo tradition (as with my Vodou oils), I try to make it very clear what sources and traditions are informing its creation (because I am allergic to buffet-style religious appropriation and spiritual mix-and-match BS).
When it comes to items created for particular saints and spirits, I try to do the same thing. Hoodoo as a system of folk magic is not a religion, though it springs from and is informed by a largely Protestant Christian culture and most practitioners have historically been Protestant Christians. There are exceptions in historically Catholic-heavy areas, and I'm from one of these areas. Easily 3/4ths of my ancestors on both sides of the family were Catholic, from regions along the Gulf Coast with Catholic populations that were considerably larger than was usual elsewhere in the country.
So it's true that you cannot just lift hoodoo out of the Christian context in which it has been practiced since its emergence as a specifically African-American folk practice and still legitimately call it hoodoo. But you can certainly leave aside the saints entirely. Most rootworkers don't work with saints. Of those that do and that have historically, there tends to be a relatively small lineup of saints with widespread fame who are commonly petitioned.
I work with a much wider variety of saints than is typical in traditional hoodoo. And in addition to the approved and recognized saints of the Catholic Church, I work with a number of folk saints and spirits, some that have entered hoodoo through various cultural contacts (e.g. Maximon) and some that cannot be said to have entered hoodoo at all, at least not in any broadly recognized way (Legba and other lwa of Haitian Vodou).
That means in some cases, formulas I make for spirits and saints are not really traditional hoodoo but are informed by and spring from another culture or system. I try to make that clear in the item listings and provide some background, but feel free to message me and ask in any case where you want to know more about a formula or spirit than I've gotten around to typing up yet.