Splitting bedrooms to make tiny bedrooms isn't really an option either... windowless bedrooms aren't bedrooms and no one wants them - if you really need extra space then you need to create extra space, splitting rooms is still the same amount of space!
Don't spend money making your property worst, get onto rightmove and look for something suitable for less than £36k difference
We'd be splitting the bedroom to have a small bedroom and small bathroom (Roughly 4m squared each 2.3m x 1.7m) . The current bathroom would be converted to be a double bedroom.