Keyboard Shortcut for Cautionary Accidentals

I'm working a lot on transcribing very chromatic scores at the moment that incorporate a lot of cautionary accidentals. I'm usually fairly quick at inputting as I can do most of it using the keyboard and am very familiar with the shortcuts. My only issue is that there is no keyboard shortcut to add a sharp, flat, or natural sign! Of course for normal usage this isn't an issue as you can move up and down with the arrows, however if there's a note that is already supposed to be natural that I have to add a natural sign to do, I have to use my mouse to click on the natural sign every time.

I'd much rather there was a shortcut (optional even?? something that you could set yourself?) that you could press it and it give the note its correct cautionary accidental (along the lines of the j key), i.e. if it's already a flat from a previous flat in the bar it gives it its own flat. This would save me literally hours of time as I wouldn't have to interrupt my flow every time I need to add a cautionary accidental.