al, it's not the cosmetic side of threads being exposed that's the worry, it's more the issue of inadaquate spoke engagement. Plus, it's nice to have a few threads on here that are actually something to do with bikes.
Oh, the rim is a Stan's Arch 29er 32 hole.
If I was being overly anal, I'd just buy the correct lengths. The thread was more about which is the best direction to bodge things. Bodge to a longer spoke and risk bottoming or bodge to a shorter spoke and risk not getting enough engagement. I had hoped that someone would be in a position to say they found that normally the wheelpro calculator and measuring methods were over/under typically.