A:AnswerThe flip does have eSIM functionality, but carrier compatibility is kinda hit or miss, i believe verizon still requires the physical sim due to "competition" from the razr. so in short; yes it has it, but your mileage may vary.
A:AnswerThat will be up to Tracfone whether or not they charge a fee to transfer to a new device.
Buy the phone from BestBuy with the "activate later" option, and swap the sim card yourself.
If the phone does not automatically activate, you will likely have to contact Tracfone, at which point they may try to charge an activation fee.