Adding a suggestion above me. There is no shib token that supports bnb (beacon chain) as far as I know, so this request is impossible.
Besides if you successfully swap to bnb native coin (bsc), you don't need to migrate the network to beacon because functionally, the bsc version has wider usability and acceptable in more ecosystems. If you have at least $0.1 bnb balance in another wallet I think that is more than enough to complete a single swap.