Those straps are padded, so you can buckle them on as snugly and securely as you want without them cutting into you at all, like many strappy sandals do. It's magic, and I own two pairs in nude & navy.
If your shoes are only peeking out of your gown a teeny bit, why not wear a shoe that's minimal and comfortable, like these? They won't see the low, slightly substantial heel or the hidden platform, just the flirty peep toe peeking out.
Maryjane straps are the best. You know that 'I'm falling out!" feeling you get in some pumps, like you could just step out of them? It doesn't happen here. Plus, the hidden platform makes the height so much more manageable.
"prince" mary jane shoes, $38.22, new look, asos.com
Another gorgeous option that tops off at 3 inches.