Well, your and my success at 12+ years of clear coat over gel coat is a pretty good testament.
But.....
I have applied Clear Coat over the same gel coat with only 3 years of adhesion. Of course I am a beginner amateur.
Boaters have done the same but I do not know of their success result.
I have currently applied Zep Wet Look to my gel coated only areas. If one does not routinely apply a fresh coat of Zep annually, you will probably have to remove the Zep and start over. Materials Cost of application on my rig was about $15. Cost of removal will be about $10 plus my several days labor. (About the same amount of time as waxing and machine buffing if you have to remove the Zep IMHO.)
At 24 years of age, the Clear Coat on my base coat painted surfaces is still 99% good.
Whatever Country Coach did with their paint process seems to provide great results and is probably hard to duplicate in the after market paint shop at today's prices of labor.
I do not know what the best solution is for a long term result unfortunately.
But I will stick with the Zep solution due to its cost effectiveness.