The DUNS number is nothing to do with Apple, it's all handled by a separate company and something used internationally by many companies, not just Apple.
1. Why don't you just register as an individual and then convert the account to a company one once you get your DUNS number? 2. Why is it taking so longer to get the DUNS number? I registered my business with the government then applied for the DUNS number and got it instantly via email[1].