If it's better to match the centre bore, and perfectly good wheels with the proper centre bore are available, why use the rings? I'd just get wheels with the proper specs. For our other car I use the hub centric rings because I had to accommodate the winter wheels my wife picked for aesthetic reasons, but honestly, my proper-spec wheels look better and they don't require the rings.
If you're the only one that's going to be changing wheels on your wife's car, it's fine, but you can imagine a time when you're not around, and your wife needs someone to put the spare tire on or whatever. Different centre bore, rings, different lug nuts.... It's better to just use standard parts to accommodate whomever will be doing the work. It's not about the purchase price of the rings.
In another thread, someone said "there are perfectly good non-directional tires available, why pick directional ones." At least anyone changing seasonal tires will know which way they go on (or, anyone that you allow to change the seasonal tires will know), but you can't always pick who's putting the spare on.