Ignore the Rockets part that was just unloading contracts/players that I don't think will be back next season.
First Part the Hornets they have wanted to get off the Gordon Hayward contract for awhile so my idea is OKC takes on the contract and buy him out, but they do this while getting a young center who's a nice rim protector behind Chet and a future first round pick. CHarlotte gets back two young players that could develop further or at least it makes charlotte worse and allows them to tank.
Second part OKC trades up to Utah's pick and Utah also gets back their pick for next season.
The draft OKC drafts a PF in Taylor Hendricks at 9, instant impact guy who would fit perfectly on this roster. At 37 they take high upside guard from NC State Trequavion Smith and at pick 50 they take french project Bilal Coulibaly (again probably a 2 way contract).
Finally in Free Agency they sign Tre Jones to be a back up point guard.
Line up after offseason
SGA/Jones Giddey/Joe/Wiggins/Trequavion Smith Jdub/Dort/Dieng Hendricks/Kenrich/Poku Chet/Richards/Jwill
Plus I know for sure OKC will use all 3 2 way deals and I think Bilal will be there and the other two are but would guess a Point Guard and a big fill the other two spots.