I picked up a PO Deep Black last May and it was one of the best decisions I've ever made.
Like you I was not a fan of the factory strap so I was keen on simply being able to install the black rubber strap that was meant for the 8500 PO cases. I figured this would work because the gator and rubber band that comes on the Sedna gold Deep Black fits my CeraGold PO (and is a great alternative to the factory gator and calfskin installed).
Nope, doesn't fit. Not by a long shot. The gator/rubber backed strap that comes on the Sedna gold DB is a great option and I ended up picking up a couple of those (I'll try and find a pic). It makes the watch look a little "dressier" if that's possible for this piece.
So, back to the drawing board. What I didn't like about the factory BD strap was the contrast white stitching - so, I removed it and re-stitched the strap with a heavy gauge black nylon. Looks awesome! (if I do say so myself).
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I'll track down (or take) a couple more pics later (wearing a speedy today).
As far as strap changes go - I haven't bunged up the case yet. In fact you'd be hard pressed to find a single hairline scratch anywhere on the case and I've put it through its paces (two bachelor parties, sever flights, the gym, the pool, etc).
I also picked up the nylon/leather backed all black Omega NATO but I haven't bothered even using it yet because I like this option so much now. I haven't tried any other NATO options just yet but your question has now made me temped to play around a bit! I'll post some pics if/when I do.
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