A different angle on this would be - if you are going to be buying new pedals and shoes anyway, you might as well get road shoes and a true road specific pedal system. SPD pedals can work fine on a road bike, just as a hybrid bike can work fine riding on roads. But road specific pedals work better for road riding.
It really comes down to how much walking around you plan to do when riding this bike. If you will be riding the bike to places where you will be walking around for a good bit of time on most of the rides on that bike, SPD makes sense. But if you mostly plan to ride the bike with only occasional short stops for snacks, hydration and potty breaks, a road system would be my choice. I wouldn't want to walk a mile in my Look pedals, but with Kool Kovers in place, a walk through a convenience store or restroom is no problem at all.

Pedals aren't welded on. You can quickly change to SPDs if you are planning a ride that will involve more walking than your normal rides. That's what I do.