Capital letters without holding down shift

[orlp]

I have a keybind set to underscore on a key in layer 0. Ideally when holding this key down it does not capitalize other letters, which it currently does.

Is this possible in some way?

I understand this might be complicated to make work with key repeat, but I would be satisfied if there was some way to bind a key to "shift down, -, shift up", unless shift is being held, in which case it just becomes "-".

The reason for this request is because occasionally when typing an under_score in the middle of a word I might not be quick enough with releasing the key, resulting in under_Score, despite me never pressing shift.