Mortalchipset No, LTE is not supported.
Sure, you can change the hardware, even with Heads. With Heads, you can verify the integrity of your firmware and boot process with a USB Security Device. If the firmware has changed (because of another motherboard or by firmware changes), you can still boot, but it can be unsafe; so Heads doesn't block the boot process, it only warns about possible manipulation. We are currently investigating the feasibility to realise a Heads firmware version for these new models, including the V56 Series. For now, it is only available for the NV41 Series.