Running it in some more, actually using it, more oil where it needs it, and the drop of 30wt. will help with the noise. Who knows how long it sat in that sad condition, it can only get better. No, regular sewing machine oil probably won't help the bearing, but you can try one drop and see. I wouldn't use any more because it's so thin it might run through the bearing before it has a chance to mix with the hard grease. That's why the thicker 30wt. is recommended. I have a syringe of 30wt. because I run into this issue from time to time.
Cari