You won't get much space to keep the helmet under storage. Moreover, there is no portable power bank available for charging the vehicle, and for the delivery and waiting period, we would suggest you please connect with the nearest authorized dealer in your city as it depends on their stock book. Follow the link and select your desired city for dealership.
The brand has not shared this such information so we would suggest you to get in touch with the authorized dealership as that will be an appropriate point of contact to get assistance for your concern. You can check the dealer details here.