Hungry output capacitors aren’t the only failure mechanism here. Power cycling will cause problems if the Vgs isn’t properly clamped. A big (ish) capacitor directly on the gate will remain charged, and when the input voltage collapses, BANG. Power reapplied, dead mosfet. This does get worse with an output cap, which may also remain charged. The solution is a RESISTOR between the cap being multiplied and the gate. Zener on vgs, fast diode on Vgd. 100 ohm 2W MOX doesnt add any real amount of noise, and limits peak clamp currents well enough for a few events back to back (might not take cycling on and off repeatedly all day). I use exactly this with a regulated supply, where it’s not just a cap but a string of zeners - bypassed by a 100 uF cap to quiet them. Conceptually, it is similar. I test it by collapsing the input with and without load, and with momentary shorts. I also use single slope SOA protection when drain resistors can’t be employed, which isn’t that hard to add. If you want it to survive a long duration short that becomes a must-have.