Very unlikely to say the least.

Lets put aside getting all the needed hardware drivers to have a usable system on the device. And that large parts of Harmattan are closed source and thus can't be really used on another device.

It is almost certain that the bootloader is locked, meaning that it would only run firmware images signed by Nokias private key. So even if you had Harmattan or some other alternative OS, it won't let you replace the current one.

Its kinda shame that such a nice hardware is wasted for such a crappy OS.

tl;dr:
you can't even replace the OS (if you had something to replace it with) due to locked bootloader