Can't you just devide it into two parts in ZBrush? And import the two parts in 3DCoat?
Or, a better solution, cut it in two halfs, you can mirror the half in 3DCoat anyway - at least, I guess so.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt