No restock planned but it's always possible that articles come back to us for exchanges or returns so do register for notification on the product page and you will get an automatic email notice if it comes back in stock.
I like both colors but I have a slight preference for the light grey for the sunnier months.
For sizing, I would say 5 if you want a more relaxed look (like the lookbook pic) and maybe size down to 4 for a more fitted look
Have you thought about walking into a Loro Piana store or giving them a call? If they don't offer to repair/patch it themselves, they may be amenable to giving/selling you a knitdown from the factory so that you can make patches...?