enchanting haste spell

[William]

If the spell had only said "shoes," then it might have been suggesting that you needed something which had some reasonable symbolic connection to speed that could take the enchantment.

Once a spell lists generic "jewellery," I personally have no problem with a spell being enchantable into any object that is reasonably snazzy -- which a named shield would certainly qualify as. If you really want to, you could, oh, have symbols of Mercury's sandals lacquered around the border at a cost of a few hundred $, to hold the enchantment.