I agree with Bill's first comment....and even more so on his second. I'd start with a manufacturer's suggestion and then experiment with some different values. But what are you looking to achieve here? A little more extension on top?
As for phono stages that allow for such loading, if you feel you can truly hear a difference between 47k and 100k and you are handy with a soldering iron, many phono stages have a default 47k resistor on the board. Additional resistors can be added in parallel to achieve a different desired result. But to go with 100k, you'd have to replace the 47k with this new resistor. On some designs it is easy to do....not so or even possible for others. But again, how many people are going to be able to hear the difference. And where does this stop? Try not loading it at all!
As for phono stages that allow for such loading, if you feel you can truly hear a difference between 47k and 100k and you are handy with a soldering iron, many phono stages have a default 47k resistor on the board. Additional resistors can be added in parallel to achieve a different desired result. But to go with 100k, you'd have to replace the 47k with this new resistor. On some designs it is easy to do....not so or even possible for others. But again, how many people are going to be able to hear the difference. And where does this stop? Try not loading it at all!