If your not worried about buying Genuine then you could have bought a second hand line trimmer for $10. at a tip shop and put the Honda motor on the $10 snipper or just buy a new snipper for around $190 and put the Honda motor on that .This way you end up with 6 gearboxes.
A GX35 motor new can be had new for around $150 then bolt on a $10 snipper shaft and for $160 you have a good snipper.
Nothing wrong with Genuine Honda if that's what you want though.