For those without domain controllers: what do you do for internal DNS?

These days, we don't have domain controllers because everything is managed with Entra/Intune, Arc, etc.

We have external, hosted DNS that serves our public DNS records. It works fine.

But we still have a need for internal DNS because we have a lot of on-prem stuff that may never go away, and the domain controllers were also serving as internal DNS servers. So right now, we use BIND9 on a Linux virtual machine as internal DNS. I'd love for BIND9 to go away, too.

Are there any better (and cheap) solutions for this that I haven't thought of?