i dont think anything else works on the chod except leadcore, you can use a fluoro leader but then you end up weighting down the pop-up...............which then stops the pop-up floating up the line, changing the mechanics of it,for which it is used for in the 1st place.
heli/chod set up is the only way i think is safest (note safest not safe)
jem....i cant see how a running rig set up is any different to a leadclip...the link is still attached to the leadcore,meaning a break would still leave the fish trailing the leadcore........unlike the heli,where if the bead can pass freely then it should slip off the leader at some point leaving only the hooklink in the fishes mouth.
now take snagging up out of the conversation ,the is still the fiction factor of it rubbing on the flanks...but this isnt as bad as what they do to themselves during spawning,not that that matters what they do to them self only what anglers do.