If only 222nm UV lamps didn't cost so much.[1]

[1] https://cybernightmarket.com/products/mini-far-uvc-lights-se...

Still risky, these typical Chinese devices don't come with a filter, so harmful wavelengths will still be present. The filter is actually the expensive part. Also, such a small component would need sufficient cooling as these operate at 4kV. I don't really see this here, so it makes me doubt these devices.