Not many choices in the US for sub 500cc EFI bikes, and those there are are new models which means limited availability on the used market. However the Suzuki TU250x and Yamaha WR250r/x are both nice bikes and excellent for beginners.
I have a similar problem and understand your issue. However for a first bike I don’t think I would limit my choice to FI bikes only unless I was intent on buying new. A good used bike is much less expensive and if you decide to sell it for something different after a short time you will loose little.