I have a similar keyboard to OP. I have a layer with a grid of f-keys on the left and a standard numberpad layout on the right.
Combos like that are fast, simple, and no contorting or excessive stretching required since every f-key is within one key distance of the home row (I regularly use L-Alt+L-Shift+f-key combos)
A whistleblower is likely to have access to sensitive data or other forms of leverage not directly linked to whatever they’re whistleblowing on. Of course this sort of insurance policy would be useful to them.