I do make adapters that would allow the for the use of 1200i PSUs with Neptunes and most likely Titans, Searing. It just uses two PCIe cables instead of one and that bypasses the over current protection.
Definitely cheaper than buying whole new sets of PSUs. They are in the wild now and no reported issues so far. Check my post history in this thread for a pic.
Please, do tell... bro has 3 of the 1200i's for the 2nd set rrrrrrr
Found it for you.

This will spread the current between two PCIe cables and effectively keep the OCP from triggering without using the software.
Alright, I have finished a process for making a heavy duty 2:1 PCIe adapter for Neptune owners. It is made with 16AWG wires and minifit HCS (high current system) pins capable of 13A. It is tricky to make with crimping two 16 gauge wires together but I soldered the pins to the wires after crimping for best contact. I cannot guarantee that the nylon housings at the pcb won't melt so be sure there is some airflow there.
Here she is:
