Just use an Open Pro with 28 spokes. It is nothing fancy, but it is bombproof.
I'd recommend an XR270 rather than an Open Pro. My experience with Open Pros on a Powertap was poor. They're not very stiff rims and they eventually crack at a spoke hole. XR270s weigh the same or a little less and are stiffer due to larger cross section, making a stronger wheel that lasts longer.
You can lace the PT hub 1x heads in on the DS to increase the bracing angle. Supposedly the G3 hub flange spacing was improved over the older PT hub I have, so it may not work on the G3.