Need some advice regarding 1st Edition MB Strike Freedom

I own a first edition MB Strike freedom that has been on display for years:

-The display stand has yellowed from UV. Any solution to restoring it's colors? Internet says hydro peroxide. Any risks to this method?

-The figure has become dusty as well, any advice on how to clean it up?

-I am considering selling it to buy a soul blue strike freedom with a black stand, is it still worth anything in the market?

-I am considering an acrylic case for it. Are there any in the market that's firm and doesn't get shifted easily by young children?

Thank you

Thank you!