How about a VB408, a 1% resistor, a precision zener (or more if you want
selectable voltages), and a small low voltage cap?  Output can be variable
(replace zener with a pot) from 1.25VDC to 30VDC.  Input can be up to 400 VDC.
Okay, it's not an smps, but it is inexpensive, and should meet the critiria
originally set forth on this thread.

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