Use flatpak-spawn to divert to podman on the host.
/usr/bin/scanimage /usr/bin/pngquant /usr/bin/convert \
kpcli \
calibre qt5-qtwayland \
- chromium dbus-daemon tmt tmt-provision-virtual flatpak-builder
+ chromium dbus-daemon tmt tmt-provision-virtual flatpak-builder flatpak-spawn
+
+# run podman in toolbox
+printf "flatpak-spawn --host podman \42\$@\42\n" | sudo tee /usr/local/bin/podman >/dev/null
+sudo chmod a+x /usr/local/bin/podman
# debugging cockpit crashes
sudo dnf debuginfo-install -y glib2 glibc libssh gnutls