So I have an older set of Rolf Vector Comp wheels. The rear rim has a split in the braking surface, so it is trash. Since the hub is a Hugi, I would like to find a new rim. I know there are 20 spoke rims available, but they are not of the paired spoke technology, so I don't think they could be used with the hub. Does anyone know where to find a 20 spoke paired spoke technology rim or can someone confirm if any old 20 spoke rim would work?

This is only one of the reasons not to buy boutique wheels, but your only real hope is to contact Rolf and ask to buy a replacement rim. Once you see the price of the rim, assuming it's even available, you may decide to just build/have built some wheels that can actually be maintained in situations like this.