You can generate a member's future invoices and pre-pay those (or schedule them to be paid at a specific date in the future)
Go to the member's profile.
Next to the plan name, use the 3 dot menu to reveal the list of controls below
Select 'Create Next Invoice'. This will generate an invoice for the next billing period, and push out their next bill date accordingly.
You can the click on the invoice to apply payment and payment method to it.