Unstable 96V DC to 3.3V Supply
Assuming you could find an LDO with a 100V input rating, you would have (96-3.3)=92.7V across the LDO.  With 50mA through it you would have 4.64 Watts of dissipation in the LDO.  Not exactly practical.  

A buck converter at 3.4% duty cycle is challenging as well, but you might get it to work.

I would look at a small flyback converter and use the turns ratio of the coupled inductor to get a reasonable duty cycle.

If this is a one-off project you might be able to get a demo board with a flyback intended to work from the AC line and modify it to handle your input range. You could of course bypass the input bridge rectifier as well.