I have given up on the bunion correctors that work by use of a toe spreader. After 3+ months I saw zero difference AND the correctors I bought fell apart. The toe spacer pulls off from the spandex holder. I tried sewing it on, but the rubber for the spacer is so soft that it eventually pulled through the thread.
I might consider the type that work like a splint, but I think that you could only wear those at night. I don't think they'd fit in a shoe, and if they did, they'd likely be uncomfortable.
I do appear however to be seeing a small improvement using the massage technique that GGMM mentioned. Basically I pull the large toe straight away from the foot, then gently pull it down and away from the other toes. I hold it there for 30 secs or so and then do the same, except I flex it up and out from the other toes and hold for another 30 secs.
I think that if you could spend the minute when you get up and before going to bed doing the massage technique, you may see an improvement over time. I don't always remember, but still seeing what looks encouraging in terms of some improvement.
I think the ideal would be to take a mold of the side of the foot with the toe held in the correct position, then make a custom molded splint and use spandex or velcro straps to hold it in place. Something like that may also work and be comfortable inside a shoe. Since this is custom, it wouldn't be something you could order online.