neither the bit nor the screw head can withstand the torque of a standard Torx or Hex fastener

Which “standard” Torx head? Maximum torque of 0.43Nm of a T5? Or maybe 10.5Nm of a T20? 132Nm of a T50? T60 is rated for 437Nm.

If you need a bolt that can handle 50Nm, you put a head that’s sized to that on the bolt.
If it’s a Torx, you put a T40. If it’s Hex, you put an 8mm on it. And if it’s a stupid BMW one, you pick the size that can handle 50Nm. The shape doesn’t matter.