So crass and very 70's but, what about little volovants? You can buy the little cases and all you would need to do is make a mournay filling. I wouldn't normally think of them but considering you don't have a lot of time yourself I would be combining part ready-made with part homemade.
- Cheats sausage rolls - puff pastry and little chipolata sausages. Grab a jar of chutney to serve
- Finger sandwiches. Use easy fillings like shaved roast beef from the deli, sundried tomatoes, rocket or baby spinach and a nice soft cheese like Camembert or Brie. Other fillings could include a finely chopped BBQ chook, whole egg mayo and cress or alfalfa
There's a few suggestions for you.