I could do this at a squeeze so they wouldn't be home alone all day, but would this really help?It could depending on the work you do, if you were to have your own office and be working in there as I do you could easily have Harvey in there with you, he would snuggle up at your feet or on any sofa's or chairs you have there, you could then install a dog gate into the office doorway, so that Jasper can still see you and eventually learn to settle on his bed outside your office, either to sleep, or to be chewing a kong or knuckle bone to keep him occupied, (occupied being the word here) boredom causes destruction hence your wrecked furniture,

if you don't give a dog entertainment, it will definitely make it's own, usually at our expense
My mothers Working Cockers all over 3 years old will happily be couch potatoes now though, they lounge around just like the Show Cockers for a good 4 hours after their exercise, so bare in mind his age is making a lot of difference here.
So hypothetically going with this, the two dogs would be seperate, you are also home to keep Jasper in check and keep yourself as the boss, you could take tea/coffee breaks to interact a little and hopefully a little lunch break to take Jasper and Harvey out for a walk or ball play too.

Hubby could easily do a morning walk before work, he could take the dogs at 6-7am for a nice 60 mins before he goes to work, (I've always done that) So, with a morning walk, you home in the daytime for interaction and maybe a quick walk and then an evening walk too, that will be enough. Show Cockers need approx 90 mins exercise a day, Working Cockers obviously can do more.
It depends how badly you wish to keep him, if he is your hubbies baby, it may be worth a try.
I have a little niggle about his breeding, did he come from a good breeder? Young workers can sometimes be a little hyper if not given enough interaction and exercise, but they are generally a very easy going breed, not generally confrontational. But, I'm thinking it is just his age and predicament he's been left in.
Think long and hard, it's down to you both at the end of the day. I know you are having a baby soon, but if hubby takes on the lions share of dog walks it can work.
If you decide to let him go, please send him back to breeder as hopefully they will vet a good home and he will then have a forever home and not be past on to others who think him the same as a Show Cocker.