I would have to firstly check the actual reading ,
THEN, compare it to the wind speed and direction given on the ATIS ,
THEN, compare the two readings ,
THEN, establish if the difference is considered significant
Should you not be doing this anyway to see if the ATIS needs changing?
Honestly, your '5 actions versus 1' isn't that difficult - you would have to look at the wind reading and pass it to the aircraft anyway. I was always taught that the wind instrument check should be part of your scan when issuing takeoff clearances anyway - and simple mental calculations of +/- 10degrees or 5 knots, well, are simple.
Sorry, have to disagree with you on this one. The book (and my logic) says required only when significant, but there's nothing stopping you passing it all the time.
Cheers,
NFR.