If Debian stable is something you could compromise on, there are prebuilt images for the pocket reform: https://reform.debian.net/
Otherwise, as far as I understood, you will need to patch the kernel of your target distro yourself and provide the device tree file. See this answer and the whole thread in general: Other Linux distributions that Debian? Ubuntu?
However, since Devuan is Debian-based, you should have a good chance to get it working without too much hassle…