I’d like to briefly announce here that I have a mostly working Droidian port available for the Zinwa Q25, a BlackBerry Classic (Q20) restomod with modern internals! All information is currently available in GitHub - JamiKettunen/droidian-zinwa-q25: Running Droidian on the Zinwa Q25 (Blackberry Classic restomod) . Dual-booting with Android through microSD or even userdata repartitioning are supported and documented in the repo wiki. Here’s some pics 
For now though enjoy the initial release! I’ve already sent some PRs to Droidian repos to support my custom additions to the initramfs for example. Work remains to be done before the hacked together LVM images will have a proper adaptation package too and so on but this will be an ongoing process and I’ll plan to have some kind of upgrade path for this without data loss since encryption is supported and it should resemble the final filesystem structures.