I wouldn't be so quick to dismiss these.
The rear looks promising.
The front, I think would work fine on most gravel surfaces.
One thing I've noticed in swapping between full knobbies and semi bar tread adventure tyres is that on gravel roads, and hardpacked base with shallow loose surface, the more road oriented tyres work better. Full knobbies work when you're in soft loamy dirt, loose rocks, or in mud. But on hard pack with a dusting of gravel they skate and float around like a bastard.
I rode some trails a week ago with a front Pirelli Mt90At, which I really like as an all round tyre, and then again this weekend with a Scorpion Rally front. I have a Scorpion Rally rear on at the moment.
Until the thunderstorm made everything greasy and sticky, the knobbie was losing. It works best in the pure off road/no road environment. The MT90At works better everywhere else. Wet dirt, the knobbie rules.
This Metzeler is more open than the MT90AT, but less open than the Rally. I think it could work well for me.