One thing that jumps out:
FLL to Nice and FLL to Mexico are very different missions.
Trans-oceanic 10+ hours and 2-3 hours across the Gulf of Mexico. That calls for different equipment
-While you are penciling out the cost of ownership, you sholud get a quote from Flex-jet for each trip.
-Also get quotes from AA & Air France out of KMIA.
Thse options have zero capital requirements and zero employee requrements.
If I were you, I would buy a nice King-Air large enough for my party to go to Mexico and to have the pride of ownership. You could fly it yourself with adequate safety margins. Then, when going to Europe reserve a portion of the first class cabin on Air France and drink/dine/sleep across the Atlantic with limo service to and from the airport curb.
The King-Air will hold its' value and you could lease it out if you wanted to.
The impressive factor in a King-Air is still present for members of the public. Walk around and sit in a nice -350 and see for your self.
R