I had a conversation with Keith Herron at RMAF and he was also against cartridge loading feeling 47k ohm was fine for MC. I myself do not agree and while I respect his opinion I decided to buy another phonostage.
That being said, if you don't want to mess with swapping the resistor internally (although in my opinion this is what I would do as it should be very simple to accomplish), then another option is to run the phonostage in MM mode and use a step-up transformer such as the K&K Audio which allows you to easily plug in different resistor values to alter the load. For example, if you use 47k ohm in the step-up, combined with the 47k ohm in the phonostage you will net a 940 ohm load (don't worry, there is a spreadsheet on the Galibier Design website that has these calculations all figured out for you, its what I use). Again, I'd do this directly in the unit, but options are always nice to have.
That being said, if you don't want to mess with swapping the resistor internally (although in my opinion this is what I would do as it should be very simple to accomplish), then another option is to run the phonostage in MM mode and use a step-up transformer such as the K&K Audio which allows you to easily plug in different resistor values to alter the load. For example, if you use 47k ohm in the step-up, combined with the 47k ohm in the phonostage you will net a 940 ohm load (don't worry, there is a spreadsheet on the Galibier Design website that has these calculations all figured out for you, its what I use). Again, I'd do this directly in the unit, but options are always nice to have.