It's a bit hard to imagine what you want exactly. If that "hood shape" is seperate from the shifters and brake levers so you have to move your hand to reach them then count me out. Just like bar ends, I hate that.
Might be just me but I never hold the hoods when the going gets rough. I find the drops a much more secure position, almost straight bar like. Of course it's never going to be as stable as a super wide straight bar.
On a rough descend if I hold the hoods I barely have control over the bike, the brakes, and it feels like the handlebars are going to rattle out of my hands. Then I go to the drops and I can go even faster and feel way more secure. I can grip the handlebars firmly but still relax my arms to absorb the bumps. Personally I very rarely hold the drops to be more "aero".
IMO there is no need. It's the usual argument which a lot of the time is not true, but in this case I think it is. If you want to turn your gravel bike into an MTB, just get an MTB. I know, doesn't really sound open minded, just my opinion.
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I was looking for a new gravel frame that could take 2.2-2.3 tyres, a 180 rotor etc. Then I realised I would be better off on a hardtail...