You make a switcher that's noisy but gets you down to something like 40V, then go linear down to 33V.
And the LM317 only really cares about the Input->Output differential. Doesn't matter if it's dropping 20V to 5V, or 100,020V down to 100,005V. So, you could go 150V->120V->90V->60V->33V. A bit on the complicated side, but simple and gets the job done.