Those blue dials do change a lot in different lighting ... something I really like. They shouldn't have faded or "developed a patina" with the materials that were used then and the relatively short life they've had, but you can't be 100% sure unless it's in your hand. Best advice is, when you find one you particularly like, contact the seller and ask for lots of different photos.
When it comes to the strap, there are lots of good leather strap makers out there who would make you a custom strap for less than $50 to fit the watch head and existing deployant. Alternatively, if you want an Omega strap, then you can also order smaller versions from them.
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