In the end I thought he might brighten the day of a friend, so followed this pattern and free-styled the trimmings a little.
I didn't see the pipe-cleaner feet as strictly necessary, especially as he had no problem sitting up thanks to his lentil filling.
It did cross my mind that you could knit a great set of 'Angry Birds' characters with this pattern, and use this one for the pigs. All you'd need then is some wooden bricks and you'd be sorted! Hm, maybe one to plan for a Christmas present, circa 2020 (by which time no-one will remember what Angry Birds was).