IF Nurk took the QO...
We'd have about $6-$9 million to work with under the apron and would possibly be under the luxury tax. So using the TPE to do a sign and trade is still unrealistic because we'd be better off just finding a way to shed a tiny bit of salary and use the MLE which in essence would be the same thing.
If Nurk signs the QO or signs for about $10 million the first year...
If we did a sign and trade it would have to have equal money going out to the other team or more than coming in. So if Aminu was our bait we couldn't take back more than $6.8 million or whatever. If Turner was part of the trade we could take back $17.7 million, the problem is finding someone who would take Turner. The TPE, MLE, and any other method of signing players would all go away and we'd be unable to make any transactions until July 1st, 2019 unless it was a trade with less money coming in.
The problem is some of the guys who fit for this type of sign and trade like Randle and Parker are on teams needing to cut payroll, not add to it so it's unlikely they would want to take back anything in return. My scenario in the TPE thread would be the only way and that seems pretty far fetched.