So where exactly are you meant to go if you don't go home when you take your return travel from last international stopover? If you go somewhere else apart from home, then you're at another international stopover, non??!!
You certainly can't "transit-hop" on the way back home from the last stopover with -24hour overnights as the coupons on the ticket will have the not valid after date of whatever the 6 months date is and render them invalid for any booked dates after that.