You’re correct; Business is one of the legacy plans, and the nearest current plan would be Advanced, and you’d need that or one of the Enterprise plans in order to use AI Studio.
There are consequences to switching plans so you should review the posts here in the Forum on that topic and reach out to Sales and ask them your questions. You should also expect to pay an additional fee for AI Studio because the allocation of free credits is very limited and may not even cover testing new workflows.
Thanks,
Larry