Companion plants for nettles? Hmm...apparently almost anything. I'd suggest Jewelweed, it's beautiful and it off-sets the sting from Nettles, otherwise perhaps something that grows taller so you dont have to dig in a nettles patch to get the items.
I found this on youtube but I wasn't able to watch it due tomy limited bandwidth off-grid, but it's on the subject.
Hope this helps at least a little!