if i am not mistaken, there is a rather faster way when using manual lens.
switch to Av mode and AF-S. fully press the shutter button and slowly turn the focusing ring. the pic will be taken once the focus is in.
but not sure if still can use the green button or not haha...
Well, green button stop down metering works only in M mode, but the AF-S technique you described works in M mode. I've used it before