Thank you for your thoughts. While many conservation organizations oppose "synthetics," there is a growing body of evidence that supports their development:
https://www.pembient.com/conservation/
As far as customs is concerned, smugglers view the confiscation of suspect horn as a tax, a tax that they budget for and that rhinos pay through additional harvesting. Furthermore, customs officials often do not undertake the expensive and time-consuming efforts (e.g., controlled delivery) needed to dismantle the smuggling networks.
If necessary, we can assist customs by including a secret DNA watermark in our product, so they don't waste their time tracking synthetics:
However, assuming synthetic horn is cheaper than illegal [wild] horn and there is no way to certify the latter, the case of a "mixture of both illegal [wild] and synthetic horn" (i.e., laundering) should never happen. That is, it would be more profitable to sell synthetic horns as wild than wild horns as wild, so why ship a mixture?
Finally, the job of customs is going to continue to increase in difficulty regardless of synthetics: