It's always tempting, but not a great idea to start a Gold Star on the center stand. The undercarriage isn't strong enough to survive that abuse long-term. However, it's a much worse idea to start it on the side stand so I can understand if you feel you have no other choice. If you're not already aware of it, BSA made a loop that makes lifting it onto the center stand a lot easier.
You shouldn't have a problem finding one of the loops from many of the usual suppliers or on eBay.