When I hear the term "Feeding Mode" I think of the the hyper-alert, ready to strike and take down anything mode they can get in to at feeding time.
Sounds like you just want your boy to feed. Welcome to Ball Pythons, and make friends with patience.
There is not a need to feed in a separate tub. Make sure your husbandry is dialed in (MULTIPLE resources on here for that) and offer the appropriate sized meal weekly. If it gets to be more than a couple of months, depending on his size, you MAY want to consider the next step.
For now, husbandry and patience.
Oh, and you can humanely kill and freeze the pup.