If Danny is able to sign Hayward, the only logical solution is to trade AB for future draft considerations. I know this may be upsetting, but it just doesn't work any other way with our roster construction and luxury tax implications.
IT, Rozier
Smart, Fultz
Hayward, Jaylen
Crowder, KO
Horford, Zizic
In this scenario, we are already forcing Crowder to play PF, although I suppose KO could start with Crowder coming off the bench behind him and Hayward. Jaylen, Rozier, Fultz (or Jackson/Tatum) will need playing time (and will deserve playing time).
If we are unable to sign any respectable free agents, then we can go with the same line-up, except slide Smart to SF and AB back to his SG spot. Again, this is probably too small of a line-up, but we have better small players than bigs. We would be able to afford everybody, but would really be counting on our younger players to make us contenders.