The only thing that would help you in that case is having an account at another registrar, with a similarly named domain (maybe different TLD, or added word in front of the domain name) that is established as a alternative but rightful domain in case of failure. Test the fail-over process and make sure your documentation describe what domains are legitimate fail-over domains for your users.

Also, chose a registrar that won't just terminate your account over nothing (like Google is famous to do). I've had good luck with DNSimple over the years. Sign up for their enterprise plan and make sure to stay up-to-date on their policies. If you see that they start acting "googley", start thinking about moving to another one.