my regular fly casting equipment? I ask because I fish lakes often with larger streamers. Sometimes on a sinking tip, and often on a floating line. Perhaps there is another casting technique, but the one I'm using is frustrating because it take A LOT to get the tip, and or, streamer out of the deep in order to make the next cast.
You can use spey-casting techniques with any fly equipment, single- or double- handed of any weight class.
That does not absolve you of obeying the laws of physics.
If you have a lead-weighted 6" bunny streamer sunk 8' deep, it is going to take some effort to bring that to the surface. If you go straight into a spey cast without bringing that rig up, it is going nowhere. Assuming you don't break your rod.
With a long two-handed rod, it is certainly easier to do a slowish lift or circle to, with relatively low effort, to bring the a longer tip/fly up from further down. Conversely, you could expend more effort roll-casting up to the surface.
The difference is more about wise application of effort, and the ability to lift more line that longer rods provide, than spey-casting. You could as well lift the tip up and then go into a two-handed overhead cast.
That said, some spey casts do lend themselves to bringing up sunk line as a natural part of the cast. But with a spey cast, you are also constrained by whether your line has enough mass to turn over the fly once it is out of the water.