I have found that celestial seasonings likes to put a lot of lemon grass in there herbal teas and from my experience non of that flavor survives primary fermentation. Also the concentration of actual hibiscus and rose hips in the tea is limited. I would say get some dried hibiscus floweres and some rose hips to use rather than the tea blend. Just because the celestial seasonings tea I use just don't have flavors that last. It might be good if you steep the tea in secondary only. I haven't tried that.
For hops I think I like Saaz hops in mead. I think Saaz and honey mix well.
A painting says a thousand words. But a painting while on good mead just looks funny!