I still make the KD trade if it's like Siakam/OG + Trent + picks. The key is to keep Barnes + one of Siakam or OG after the trade especially for defensive purposes. Against teams like Boston or the Clippers, you wouldn't want Durant tasked with guarding Leonard-George or Tatum-Brown all game, which is why Barnes + OG/Siakam is needed to let KD pop-off offensively and roam defensively. Against other teams that don't have star wings, the Raptors can overwhelm those teams with the trio of KD, Barnes, Siakam/OG.
Sure there is a risk that Durant could get injured but you could say that about any player in the NBA, the difference is just probability. I don't think KD would be opposed to Nurse, he wasn't with Kerr in GS (coach who had won a championship before KD got there like Nurse). He's always spoken highly of Masai.
The way I look at it, if you don't make the trade, the Raptors are stuck in the 2nd group of teams in the East with a trio of Siakam, Barnes, OG until Barnes makes a leap. With KD, Barnes, OG/Siakam...the Raptors end up in the tier with the Celtics, Sixers, Heat, Bucks as is, with the potential for more if and when Barnes makes that jump (imagine Barnes ascending to star/superstar status this post-season sharing the load with KD).
Having a player like KD also takes the pressure off guys like OG and FVV and slots them in the hierarchy of offensive touches where they belong (space the floor mainly).