I'm not sure what you are doing that makes it impossible. As far as I know it's perfectly possible to sync an Outlook calendar with the iPad's Calendar app. At least the usual culprits, like Hotmail, work. It worked fine when Google offered an Exchange based calendar and email account. It's just a matter of choosing the right setup. There is a default "Exchange" setup which should work with most MS Exchange accounts.
If the calendar is from your business/enterprise, then then it would depend on the what their policies are. Check with the IT staff.
Also, Microsoft has an Outlook app on the App Store. If it's a business account that uses Office 360 work with that account.
I'd give that a try before going to Google calendars.