I know this may sound a bit silly, but I want to practice zuhd with my desires, and I feel affirmation about this will give me more motivation to do that.

Will the desires I have in this dunya be honored in Jannah provided that they are pure desires? For example and again this might sound silly, but I have a "wishlist" of what I want to do in Jannah. It can be as silly as "I want to partner up with this fictional character I've owned and always liked." or "I want me and my wife to have these forms as we go through Jannah and we can switch to other forms we like." or even desire to have forms that are human but with wings, fur and etc.

Again, I know it sounds silly, but I think it would be cool to have an esteemed scholar such as you to affirm these aspects of my desires. I want to not spend money and attention fulfilling these wants in the dunya, and focus on doing it in the akhira.

Would such desires be affirmed? How do I put in my mind that I should practice zuhd and wait in Jannah to fulfil these desires?

The Qur’an and Hadith are clear that Allah grants us any desires/wishes we have in Janna. So if you will have these desires in Janna, yes Allah will grant them to you. Such desires can be affirmed.

Remind yourself that within a blink of an eye life ends. It’s shorter than we think. Ans then for infinity you will enjoy the blessings of Janna. Let this thought empower you to have proper Zohod.