Still not that convinced that clipless is so much better than toe clips, i'm sure spd-sl's are on the bike but so impractical off the bike, got my DZR shoes set up now with some egg beaters on my road bike, my foot moves all over the place, i'm riding slower because i can't put the power down.
Clipless pedals are so much more efficient. On climbs if your pushing down muscles feel the burn just switch to pushing forward and pulling back and up, totally different group of muscles that are fresh.
The toe retainer brackets kind of do the same thing but its really old technology. Although if i had a really nice vintage roadie with these it wouldn't look too bad.
Carbon frame and plastic toe clips is a bit wrong. But clipless pedals and appropriate shoes are going to cost quite a bit, so if the bike will be built sooner, go with the clips.