Why is oven drying horrible? I am not sure I understand. The purpose wouldn't be to create some kind of accelerated drying effect by high heat but rather to have created a dry environment that occurs from the oven heat. We aren't baking the mushrooms. In fact the heat would be minimal possible, which should be less than that under direct sun outside. And what I propose is it won't even be on when they are in there. It just could be heated and it could stay closer to the target temperature longer due to metal interior of the oven and the dryness that the oven immediately creates. Of course you'd need the thermometer to know when to put it there.
In fact it wouldn't be worse than a tabletop dehydrator/desiccator because the dehydrating devices also actually raise temperature inside to push the drying. They can go as high as 130 °F, 50-60 °C
Psilocybin begins oxidizing at temperatures above 100f (if I remember correctly, pretty sure I do)
I did it once at the lowest possible temperature and ruined the batch my friend that I grew them for was so disappointed with me, I'll never forget it. Dehydrators usually run at 85-90f they're the best method of dehydrating but a fan will do the same job in 48 hours where as leaving them in a breeze will take 3 days (depending on humidity)
I prefer fan drying because they become as close to cracker dry as possible but without being cracker dry and 1g is still as strong as 1g cracker dry so it only makes sense to have the extra weight (they keep fine too in ziplock bags)
No one ever complains and they stretch out further that way rather then running out and feeling bad for not being able to give some fellow new age hippie their first psychedelic experience.... at least that's how it goes for me.