If the rim is bulging out, and the nipples are bottoming out, then replacing with shorter spokes will let you pull that section of the rim in. I'll suspect that it'll lead to uneven spoke tensions though, unless the bulge is really mild and/or the rim is really flexy.
Or try the washer trick as FB suggests. A true friend during those midnight builds when you just have to get ready to the next day.

I can't see how that would help unless the spokes were originally too long, or maybe not all the same length.
If you put that effort in, better have a proper go at getting the rim back to decently round and true by bending it manually first.

That's all down to how you value your time, how much money you've got, how eager you are to get cracking, your expectations on the wheel, your building skills and the condition of the rim.
I've resurrected and reused some seriously abused rims over the years, and while I haven't taken them touring, they've stood up well to whatever use they've gotten.
But I like the task, have the time to spare, and find ordering parts a bit tedious.