Recently I bought a used Bestron Alfredo DLD9070, which is sort of a budgetbrand version of the Ferrari line of home tabletop ovens.
It is quite popular among pizza enthusiasts in the Netherlands and Germany. A discontinued model used to be able of reaching temperatures up to 450/500 degrees Celsius. The model I bought however is capped at about 350 degrees Celsius due to new European laws.
In Germany, a webshop sells the DLD9070 model along with a 'tuning kit'. This kit consists basically of a 40x40x10 mm computer fan,12 V, hooked up to a 9 V power supply. This is placed above the ventilation holes on top of the oven, to cool the thermostat, tricking it into thinking the max temperature has not been reached.
Because shipping their kit to the Netherlands was very expensive, and because it really isn't very difficult to build on your own, I ordered a fan and a DC plug to hook it up to an old 9V power supply of an old WiFi router.
In the pictures you see the fan hooked up to the oven, using some M8 nuts as distanceholders, and fixating it with some steel wire. I then let it heat for half an hour, with upper and lower heating on. After that half hour, I set the oven to upper heat only, waited 5 minutes, put the pizza on. It needed 5 minutes to bake. It was a test pizza, with just tomato sauce, salt, pepper, oregano.