Why not. I have indies that are made to slip with the plastic dowel and a styro float (check my blog utahflygoddess) but, I think a thingy could work. Just put some kind of stopper like the Froghair ones. The only problem I see is the bend in the line with the thingamabobber. Mine are straight shots in the line.

Oh and deep nymphing is my favorite. I use up to 30' of straight fluoro.