Suitable fobs can be synched to the car with pscan, the only way I can think of getting around the key prob is to buy a set of locks (ignition, fuel cap & boot) with the key (s) from a scrap vehicle. Sod's law says after you have gone to all this time, trouble and expense you will find the keys so turn the house upside down first.
https://www.car-keys-online.com/mg-rover-key-code.html This company claim they can get a code to have a key cut from your vin number but I've no idea if it works.