Does anyone know if you can purchase and simply re-install a new reverb stealth cable?

Trying to un-route a reverb stealth, fed the cable back through the frame only to find the internal hole at base of seat post isn’t big enough to fit the cable + the end screw nozzle! Now have a stuck cable inside the frame that won’t feed back on itself (assume it’s getting snagged on itself). Only option I fear is to chop the cable in half, remove the fork and shake the frame to let the snipped half of reverb cable to fall out!