"There are independently controlled top and bottom heating elements, so all types (frozen or fresh) and sizes (7 to 12 inches) of pizza can be custom baked. With a rising-crust pizza, for example, you should run the lower heating element for 10-12 minutes before turning on the top element."
Bad news - the converter is designed for an intermittent 1600 watt load such as a hair dryer or iron, not for a variable load of 600/1200 watts. Most likely something will give up; either the oven or the converter.
For a $50 total investment I suppose you can give it a try. Or, get someone handy with electrical wiring to connect the top and bottom elements in series and then put a 220V plug on it!