I dont know much about botox. I think of ntos as a problem with space or the lack of it.
As the nerves traverse the scalene triangle there is a very narrowed space and scalene mucle is one side of the triangle. To me botox will never solve the problem permenantly.
It only make sense to me to take away the scalene triangle completely. I think botox is way for those surgeons that dont know how to the surgery to jump on the band wagon. Botox is not an approved therapy for ntos fyi. And it is not endorsed by the society of vascular surgeons nor experts in tos field.

Pec minor in my experience is not related to spasm. But ot certainly could as the nerves are passing through a narrow space and spasm could cause compressions. I never neede pecinor surgery. I dont have a winged scapula as that is usually related to long thoracic nerve palsy.