Hit another problem booking my TP run...

I want to book DEL-KUL-SYD-PER return but flights to and from PER are QF... the rest are MH. Tried to book through MH web site... no doos... called MH... no doos as they don't have codeshare with QF. It seems the only way I can book is through a third-party like Priceline or Travel Network but on a complicated trip like my RTW (of which this is part) I really only wanted to book through airlines in case of irops.

Before I give up on booking this part altogether does anyone know of a way to book a round-trip with flights on codes MH-MH-QF-QF-MH-MH without using a TA?