In this case you could use a chain of forward-operated diodes (n * Vf) instead of the zener.
For the (up to) 60V input pad you can't use the standard ESD protection, of course.
Use an isolated resistor feed, and a shunt regulator
topology? Look at old Linear Tech or National data
books from back when they used to publish schematics.
You will need an output transistor capable of the max
current ((VCCmax-1.25V)/Rfeed) and a total circuit draw
less than min current but that looks like only a decade
of range to me, not a problem.