I got a load of swing bin liners with tie handles and put the tray inside with the handles facing out then the litter on top.
When it comes to empying time, I just pull the liner back over with the handles and it scoops everything up and as the liners are quiet long, keeps you away from the gross stuff then you can just tie the bag at the top and do away with it.
I keep the litter topped up after he's been to reduce the smell as well and give him more to dig with so he doesn't rip the liner and put some newspaper or a liner under the tray as well to catch any overspill.
You can get kitty litter freshener stuff as well, I've got a "shake and vac" type one I sprinkle in with the litter and after the event.
You could always put some other freshener underneath which aborbs the smell like bicarb of soda, provided the cat can't get to it.