That does make it tricky :-/ Could you do something like this:
7 - WU, feed
8:30 - feed
9 - nap
10:30 - feed
12 - feed
12:30 - nap
2 - feed
3:30 - feed
4 - nap
5:30 - feed
7 - feed
7:30 - BT
Its more frequent feeding than 2-2.5hr but really, he's got to be able to sleep to put on weight too, yk?
Alternately, you could do one feed in one A time, then 2 feeds in the next, something like this:
7 - WU
8 - feed
9 - nap
10:30 - feed
12 - feed
12:30 - nap
2 - WU
2:30/3 - feed
4 - nap
5:30 - feed
7 - feed
7:30 asleep in bed for the night