I am sorry, but stores are mostly for different layous/products/endpoints. But from the RTD perspective, they're all the same company (you).
For this, shipping options are global: there's no way to have different shipping options on a per-store basis.
The only way would be to handle those orders externally, which means using the SILENT ORDER option and manage all the payment and shipping options in your target
Redirect to this page after order submittal page