I would suggest to ask around on whether HW keyboard is handled via Maliit. If it is fully through Maliit, maybe I made something incomplete while sending data between keyboard and application. Corresponding code is in Maliit plugin under https://github.com/sailfishos-flatpa.../input-context and https://github.com/sailfishos-flatpak/flatpak-runner

These days Flatpak support is waiting for AARCH64 ports. Newest runtimes are not supporting arm32 making its use bit difficult. Fortunately, aarch64 ports for SFOS are on the way and I would expect that Pro1 will be also transferred to that arch (speculation on my side). For Tama devices, that's at least in my plan