It does sound like enough work (I haven't done it 'cause don't need to. But I do know enough about sewing.)

But given the cost of some jerseys, it is worth it.
Right now, I'm annoyed I have short arms. Need to shorten my new fleecy jacket sleeves. It's very rare I have a purchased long-sleeved top that doesn't require alteration on sleeve length or rolling up sleeve wrist edges. Same for any pair of pants..even on petite sized. At least easier, unless either bottoms or tops have cuffs.

There are things about one's body that will never change regardless of weight, age later on.