Normal hubcaps will work. Nuts are left under the hubcap.
I use Hyundai ones in winter tyres. In summer tyres I use "normal" over the nuts hubcaps. Had to change one rim, and even I got a set of Hyundai rims the valve is in different position when compared to nut holes in the rim. Can't use hyundai hubs as the valve hole is in the wrong plc. I use Biltema hubcaps and they work fine.
There might be some hubcaps that will not fit, but generally speaking the center of regular hubcaps have enough offset to fit over the nuts. The OEM nuts are not that long. Only difference to normal nuts is that there is that lip, which holds the hyundai hubcap. I doubt the knowlegde of your tyre guy.