3 bikes with classic gearing. Recently, a brand new 4th I built with a 11-sp Shimano Alfine with gear choice of 39/22.
155 lbs rider weight, capable of quite a decent sustained power output.
I don't race, feel too old for that, but I still ride hard.
Net torque at hub is close to 60 Nm sustained, 100 Nm peak.
All holding up well, ~300 mi thus far on the Alfine, besides a completely new technique in changing gears.
And, you are wrong about "none of the manufacturers are willing to provide this information" - both Rohloff and Shimano do, mostly to cover ar$e from liability standpoint, merely as "recommended gear ratios".
Your "hub that can stand up to about 100Nm of torque at the cog" is fine about a peak value, but the real question is what is your sustained torque?
If it is close to mine, both Rohloff and Shimano Alfine willl do, moreso - the NuVinci 360, but you won't like the latter due to low efficiency.