OK, so for me after thinking about it for awhile I think it depends on how Ace looks by then.
I think if Ace looks like he can be a real guy, then we would have Lauri and Ace as our guys, Kessler as a starting piece, Keyonte as a potential starting piece, and some promising rookie contract rotation players. That's enough to start filling in gaps with trades and free agency. I think I just go for it at that point and see if I can get the team some playoff experience. I guess it could depend on how the draft is looking at that point as well.
If Ace is looking questionable then I think you have to try and see if you can get away with the unethical tank again to give yourself as high of a chance at a top 3 guy from the draft as you can. At that point it is even less likely that Lauri fits your timeline though, so maybe you just have to trade him and if Kessler is outwardly unhappy, then you probably have to trade him as well.
A lot would depend on Ace in this scenario.