I cringe when people use a torque wrench on drain plugs. A lot of reasons not to. The 2 most compelling are, 1- It's not necessary. 2- It often produces more problems than it solves for drain plugs (Stripped). Don't get me wrong, For lug nuts, head bolts and other high torque, high stress fittings I am a dedicated torque wrench user. I just don't feel the torque wrench is a universal solution.
The drain plugs come from the factory too tight. They don't need to be all that tight. How often to you hear of a drain plug falling out? (Extremely Rare) How often do you hear of one stripped? (Constantly) People feel that if tight enough is good, tighter is better (as they visualize their drain plugs falling out as they are running down the highway). It's just not reality. And can cause a lot of grief.
I use a Stubby ratchet (I like the articulating kind. But any 3/8" will do nicely) I grip near the head. This gives me a very good feel of what is happening. I just snug the drain plug. Works every time and is no big deal getting it off at the next service. The heat cycles your engine goes through to the next service will work to tighten the plug even more. The machining on these connections are very precise. They won't leak and there is virtually no pressure on that connection. You'll be fine and very happy the next time around. I'm still using the original drain plugs on my 2008 GS.
Next, recommended torque on these plugs is in Inch Pounds. And a low value at that. A torque wrench becomes more and more inaccurate as you move above or below 80% of it's rated range. Not to mention dropping, hard bumping, or storing the wrench at other than the prescribed setting can greatly reduce accuracy. How often do you accurately calibrate your torque wrench? Are you sure it is giving you an accurate reading? At higher values, this is not all the critical. But at values our drain plugs indicate, it is critical.
You have no feeling with a torque wrench. You can easily strip a fitting with no warning. Not so with a stubby ratchet gripped near the head.
I know that for many, a torque setting gives a warm, fuzzy feeling of confidence. But in my opinion, it is safer to trust the very sensitive nerves in your hand for lower torque values.
It's your ride. You should wrench it the way you think best. Just my 2 cents after hearing horror stories on a weekly basis.