Since you already have godox flashes, I suggest getting a godox trigger for your FE2. I have all godox flashes and use them with a variety of manual and TTL cameras. It all works fine. I recently got a Flashpoint R2 Single Pin Transceiver (2-Pack) for 50.00 from Adorama for use on my manual cameras. It works on any camera, since it is single-pin and therefore does not support TTL. It is pretty simple to operate, allowing you to trigger any number of godox flashes in manual mode (not TTL), up to 5 groups. For the godox flashes, you should be able to adjust the power (setting the flashes to manual) from the trigger. For your Nikon SB-26, you will have to adjust the power on the flash itself. Since it comes with 2 transceivers, you can put one on your camera and one on your SB-26, and it should be able to to trigger all the flashes. If you decide to go this route, I suggest you call Adorama, explain your setup to them, ask them if it will work with the setup you have.