Not to try to oversell you or anything, but I wouldn’t write out ovens that have convection capability (often marketed these days as airfry). They cook faster, with more even temperature, and it’s literally just a fan to blow air around. It shouldn’t really have much effect on the price. I think it should theoretically make the temperature oscillation much lower, too. Personally, my dumb oven swings by like plus and minus 50 degrees F with a 25 degree offset. So if I want 350, it will bounce from 275 to 375. Newer, smarter ovens can have better control methods to maintain temp.

If your current oven heating element melted itself, I would suspect that there’s something wrong with the thermostat, so there may be additional parts that need replacing.