Another option might be able to use packages from Ubuntu somehow?
I've been playing with a replica on a device (Rock64) running Armbian (which appears mostly Ubuntu based, which in turn is Debian based), and was able to upgrade it from Bionic to Cosmic to get the more recent FreeIPA packages which solved some ARM installation problems I was having (I'd use Fedora but this device I'm playing with is not currently supported under Fedora). I did still run into some issues when trying to set up a CA replica, which appear to be fixed in a new version of Dogtag but even Cosmic doesn't seem to have that update yet.
The client packages worked fine though as far as I could tell, and the base replica installation plus DNS seemed to work fine, I just ran into issues with CA replica.