I'm interested on a Nauticam mini strobe.
When Nauticam presented mini strobe for Panasonic last summer, I sent an email to Nauticam, asking the same for EM1, but the answer was:
Thank you for the enquiries and interest in our product.
We have no such plan to support the flash trigger for NA-EM1 so far. For the most updated information, please keep tune withwww.nauticam.com.
Perhaps They could change theirs plans...
Other idea to save camera battery is to change the internalflash capacitor by other with less power (from 100mF to 5mF)
I did it in a unit that I bought on eBay, and It's works...