The circuit of Elektor will NOT work when input voltage is rising above 39 or so volts. So it will work perfectly well if input AC voltage is just up to 110. No need to change anything, or almost anything. May be just the R5 changed to a lower value, say 15 ohms.

The circuit is very clever and the SMPS is disabled by the pass transistor wheninput voltage is greater than 39 so volts. Beware it is not isolated.

Ioannis