Is there something wrong with the hdmi_force_hotplug=1 setting?
LE10/kodi 19 has switched to using arm-side kernel drivers for display, rather than the (closed source) firmware side drivers previously used.
hdmi_force_hotplug (and most display settings) only apply to firmware so will have no effect.
Use getedid (described in previous post) to get the same effect applied to kernel driver.