As said above, the adapter will work fine, and the only penalty is a bit of added weight. Since it's basically a quill stem,it's only function is to support the handlebat, and provide enough holding traction to steer the bike, which is very little. Rather than rely on a torque wrench, consider tightening it the old fashioned way, by degrees until the handlebar resists twisting when you hold the front wheel in your legs.

Decades ago, many applied the concept of "race tight" when tightening quill stems. Race tight was tight enough not to move under normal conditions, but still loose enough to twist in a crash. This helped reduce damage to front end parts in a crash. It isn't as practical with threadless systems since the stemm has to be tight enough to retain the headset adjustment.