[csomar]

You extend the expiry of your domain. Make sure it's 3-4 years, so that you have lots of time to figure things out (ie: credit card expired, account locked, etc...).

Your registrar might kick you out, but is unlikely to seize your domain. If the government seizes your domain, it means you have other gigantic problems.

Overall, having your domain + DNS + Email provider all separate, gives you enough protection. Having your email as gmail has some risk but it's really a very small risk that most people just run on gmail just fine. The setup outlined by mmh is way enough.