Bill Welch said,
"I think little bit of decals would do the trick ... However not sure how to make them removable."

Well, Bill, I couldn't resist replying to that one. Canopy cement (or Hob-e-Tak which I use) is hte answer.  Apply a very small dot on the car side, apply the decal mostly dry, do not use setting solution, then remove the decal when desired!

Todd Sullivan