Sounds like you got the basic easy to do and remove mods
as far as non residue duct tape
3M Scotch No Residue High Performance Duct Tape, 1.88-Inch by 20-Yard, 1-Pack - Amazon.com
If i ever do a kamm or wheel skirts i plan on grabbing this
If you use coroplast for wheel covers you could use zip ties to secure them, i had 5k miles on my covers held on by zip-ties b4 i removed the covers to repaint em