I don't think any other pen works. I tried various wacom, from samsung and windows, and none work.
My theory is that the reason the nib is so soft is that the screen has a no-glare coating, and a harder nib would scratch it. The remarkable also has such a coating and a soft nib.
Which of course doesn't mean that Sony couldn't have designed the pen better - such that the nib doesn't break so easily when the pen is dropped, and that if it does break, you can easily get it out.
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