I've thought about trying the slide divers. I couldn't find anything on their website about a mag. Then i thought you could use the regular size and add one of those diver diggers that Capt John King sells. They are a 10 oz lead plate you add to a dipsey or slide diver for added depth. One thing that worries me is reeling mono through a twilli tip. I remember hearing somebody mentioning they experienced some break-offs from this. Sharp edges or something inside the twilli?
http://www.michiganangler.com/2013_New_Tackle.htm