Windows RT is a proprietary product of Microsoft and is closed source in every way. Distributing Windows RT without Microsoft’s consent is a sure-fire way to get yourself in jail for infringing on Microsoft’s intellectual property rights. I suspect it will also be almost impossible to make Windows RT run on any Android devices without the help of Microsoft. Furthermore, Windows RT requires UEFI secure boot, which is not available on the tf701.
On a less relevant note, except for Microsoft Office, there is zero reason for me to use Windows RT. Windows 8.1 devices are already cheap enough. If one day Intel and AMD manage to produce low-power SoCs that are powerful enough to run Photoshop and Excel, there will be no need for Windows RT then.