I guess I am old school. I don’t need a torque wrench to do an oil change. I have and had many aluminum pan vehicles. Snug enough not to leak on a drain plug is pretty easy to judge.
I would not do the fumoto valve. But again I am old school. Remove the plug make sure all oil is drained then replace plug with new crush washer and snug it up. Check it after a couple drives.
But I think a 3/8” drive wrench is a good investment. But only if you are doing more than oil changes…. There are many other tools I would put higher on my list. 1/2” is necessary since 80-200 ft/lbs is much harder to do by “feel”.