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Mechanically worse how? Stems are usually stiffer than the hangers, aren't they? (I mean, drilled stems always worry me slightly, but with proper detail design they needn't be more of a death trap than any other given stem...)
Thrustvector-
Stems are usually stiffer than the hangers, aren't they?
But they are also bring more of the steerer into the load path. It's the stiffness of the whole system that matters, specifically the deflection under a given load which closes the gap from the cable stop to the straddle wire connection. Most of the relevant deflection is bend in the steerer, which is why putting the stop on the fork crown and taking the steerer out of the equation is so effective.
When hangers like the one on Dammits bike flex, most of the movement is actually orthogonal to the cable. Even though it looks like they're bending a lot, the amount by which the distance from cable stop to straddle shortens is very small.
gbj_tester
I don't know of any current product, and they are mechanically even worse than what you already have. The two things might well be connected 🙂