Unfortunately, at this time, we don't offer any bolts-ons to bundle non-geographic minutes.
It is possible, through your my.plan dashboard options, to block all access to chargeable call services.¹
To do so, go to:
CONTROLS > PREMIUM & ROAMING > CHARGEABLE CALLS > CONTROLS/CHARGEABLE CALLS > [select user] > BLOCKED.
¹ available to Gold & Platinum account users and Essential account users via an upgrade