I finally got my hands on an orange strap after seeing them on fellow members' wrists, they know who they are!
After much deliberation I went for a mosaic-pattern cut to size FKM rubber strap attached to a generic deployant clasp. One key factor in my decision was the sheen coming out of the mosaic pattern at some angles which reminded me of old tropic straps. I have a couple of recent and genuine tropic straps but they fail to capture that aspect of the original model.
Anyway, I let the pics do the talking:









Lastly not a rant but an observation. I spent a few weeks looking into tons of websites offering orange straps and in the end I ordered from aliexpress. Delivered to my door, I paid approximately 30 dollars all-in for 2 straps and 1 clasp. In the process I found out that some fairly respectable sites appear to be selling the same straps sometimes as much as 10 times more. Although I don't know for sure, it appears highly likely that some of these sites are just selling the same product at a massive markup, which does raise some interesting questions as far as transparency and business model are concerned. As usual, there's no downside to doing one's homework!
3 Doxa listings are live on the eBay market and 3 collector listings on the WatchProSite marketplace.