Odd-sounding usage of "whose"

Aside from the normal uses of whose, i.e. for people, animals, or inanimate objects, can it also be used in regard to a motive, reasoning, or any other intangible attribute/characteristic of an action or decision?

e.g.

Annually, egregiously lavish feasts are held in memory of his late father, which (is something) I don’t understand.

Now, for the sake of concision, or a more literary approach, can it be paraphrased like this:

Annually, in memory of his late father, egregiously lavish feasts are held, whose reasoning I don’t understand.

(whose referring to the feast being held/the decision behind it, or even why people would attend)

Another example:

To appease her fanbase, she started wearing black lipstick, which (is something) I don’t understand.

Similarly:

To appease her fanbase, she started wearing black lipstick, whose appeal I don’t understand.

Meaning, I don’t understand why people/her fanbase would be attracted to it. (whose referring to the allure of "black lipstick", and the excitement it provokes.)

It sounds a bit off, but I found myself using whose within similar contexts so as to completely convey my meaning within one formal statement. Is there any other way to question the appeal/reasoning behind an action or decision, which is more formal than the former statements (using which + something), but not as odd sounding as the substitutes?