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I know people who've used the SP 15-QR adapter for fairly-long-distance-shit and will be building one up in the next month or two. No experience with eBay version.
This guy mentions a dynamo and looks to be using a Revo but not the actual set up, might be worth trying to contact, unless the 2015 fork was sensible 15mm axle or something... http://cyclistory.com/bikes/specialized-diverge-comp-carbon-2015/
You could try a reducer? Might be easier to have someone machine one in the UK...
http://www.ebay.com/itm/MTB-Tools-Road-Bike-15mm-Thru-Axle-to-12mm-Thru-Axle-Adapter-for-100mm-Fork-/262122494769
Same idea as SP have for their 15mm hubs if you want QR