Some situations in which I appreciate light/dark switches in general:
It’s day, but I’m in my room on my phone and it’s dark.
It’s night, but I’m in my computer with sufficient light around me.
I’m on the tube and it’s lighter or I’m in a car and it’s darker than outside.
But I know your time is quite valuable and I don’t have a good sense of how effortful it’d be to implement this, so take this suggestion as something I’d consider nice-to-have but have absolutely no strong feelings about it.
I think it’d be preferable to explicitly list as a reason for applying something along the lines of “Grantees who received funds, but want to set them aside to protect themselves from potential clawbacks”.
Less importantly, it’d possibly be better to make it separate from “to return to creditors or depositors”.