Wise decision, but you can always recreate it too something normal.
Absolutely not. A card "for fun" must never be transformed into serious map ! He can achieve an end disappointing.
Create a new level to play is the best solution. Create a simple level that can be played, and you have made your first serious level. And at that moment, you can be proud of your job, and you will be considered as a level designer.
I expect to see your design style.