A PGB is a form of WMO budget, it's the version where you manage the spending yourself rather than the gemeente arranging care for you. If you currently receive WMO support as care in natura (meaning the municipality arranges and pays a provider directly), you can ask your municipality to convert part of it to a PGB so you can use it for Bonusbuur. This requires a new indication decision, which the coordinator can help you request. Note that Bonusbuur is non-medical practical support, the WMO category that fits is "ondersteuning bij het huishouden" (household support) with or "begeleiding," (guidance) depending on what you and your student agree to do together.