If you wanted the appearance, they could be put in and made non-functional. The other thing to do, if you have the electrical ability is simply to wire them up to a toggle switch and switch them on when they are required. But they have to be switched off if you go to high beam or you risk getting a traffic ticket.
The stock wiring is more than you can imagine getting involved with. I've seen this done on a Hyundai and the work involved, what with the relays and such is mind boggling. But then you would have to have some way to change out the turn signal stalk that turns them on. Again, I wouldn't even attempt this. There is also a fog lamp indicator that illuminates in the instrument panel to consider.
Having trod this road in my Sonata GLS and seeing what was involved this is why when I purchased my Forte 5 door I just went and got the SX which has all of this standard. The wiring harnesses are different and they are, in my opinion, purposely designed to prevent after market modifications to achieve the stock appearance.
So, to recap, if you wanted to get the stock appearance you could simply obtain those; perhaps off ebay, and install them in the bumper. If you wanted them to work and trusted yourself to turn them off when you switched on the high beams you could simply wire them to a toggle switch which might work OK on quiet lonely country roads when fog conditions warrant their use as high beams only make visibility worse while the low beams with fog lamps enhance visibility. In my opinion, this should be a standard item, much the same as seat belts and air bags but for some reason the manufacturers haven't seen fit to do the right thing. Hyundai/Kia is not the only auto company to pull this stunt. I've seen it on other lower level automobiles as well. I would never buy a car without standard fog lamps. Kia; are you listening?
Good luck whatever you decide to do. As Bill Clinton would say, "I feel your pain."
FYI:
http://www.hyundai-forums.com/index.php?showtopic=36337&hl=fog+lamps