When one of mine had angel wing (my little girl Tuesday) I wrapped just the wing and it did the trick, wrapping it with the body will probably give it more stability but it isn’t always necessary.
Keep in mind it usually doesn’t take too long to correct, usually 3 or 4 days. You can also remove the wraps at night.
If you can’t get find a vet don’t feel too bad, it really isn’t surprising, only avian/exotic vets will see birds and even among them not all of them will see “poultry.”
Now if rickets is the issue you should probably get some vitamin D3, it could be a calcium or phosphorus deficiency but usually with rickets it is usually a deficiency in D3. You can keep giving B vitamins but it really won’t help with rickets because that isn't the cause.
Something important to remember, vitamins like the Bs and C are water soluble, so overdoseing on them isn’t really much of a worry, even if you take/give to much the excess gets filtered out of the body quickly.
However vitamins like D and calcium are NOT water soluble and it’s harder for the organs to filter them out and they can build up in the blood stream and cause serious health problems. I’m not really sure what the appropriate amount is to give to a gosling, hence why I though it would be a good idea for a vet to determine if there is a deficiency or not first.