How to use a key to replace another key?

[Freed-Wu]

I try to use rime to input japanese. ノート shoulde be no-to in dictionary, however, - will become page down. Is it possible to use _ to replace -?

I try:

  key_binder/bindings/@next:
    accept: Control+minus
    send: minus
    when: always

can work,

  key_binder/bindings/@next:
    accept: underscore
    send: minus
    when: always

cannot. However, in mobile without keyboard, ctrl is hard to be typed. So is it possible to use a key to replace another key?

TIA!

[LEOYoon-Tsaw]

Don't use key binder, use speller/algebra to transform - to _, and include _ in alphabet