mobian afaik has the most comparable wrt touchscreen keyboard
which after a little more scrutiny it appears unfortunately depends on wayland/gnome & systemd ,..
fortunately
( for any humans reading ) i just discovered "Movuan"
"Devuan derived distribution for Mobile Phones - Movuan" @
https://dev1galaxy.org/viewtopic.php?id=7094 which might provide a more interesting alternative ....
especially if any reincarnation of dcore or similar re-appears
--- also Maemo Leste which ( according to auto-spam-suggest was/is also devuan based )
was previously mentioned @
https://forum.tinycorelinux.net/index.php?topic=25475.msg163225#msg163225...ftr
it appears there are builds for raspberry-pi 2,3,4 and many other arm devices
and..
There is also a 64bit virtual machine you can use to try out Maemo Leste.
https://leste.maemo.org/Virtual_Machine+
Converting the qcow2 image to raw allows it to be used on real hardware.