Can older Nikon Speedlights like SB-25 SB-26, and SB-28 be used with newer flash and camera technology when mounted on SU-4 Slave units? Example would be D750 with a SB-700 as main light and then the aforementioned Speedlights mounted on SU-4 units as slaves to light interiors, models etc. Any knowledge if these things would all work together would be appreciated.