The simplest option is to purchase a new or secondhand 2.4ghz transmitter. I went for the conversion because I like my radio, I still required 40mhz for submarines and I had the tools and ability to do the conversion.
I can't give a specific recommendation for the Jeti conversion, becuase I haven't got one. I have used other Jeti kit, and found it works very well. AFAIK, there is no soldering with these kits, which does simplify things.
The Jeti modules do appear to come with better guides for converting transmitters than sets like the Corona, where you are left to find out for yourself where to tap off for power, ppm signal and ground.
I used a Corona DIY conversion set to convert my FC16. I found the conversion straightforward, the hardest part was deciding where to locate the bits and bobs. I do advise caution if you lack good soldering skills and the ability to test with a multimeter.
The F14 has a different board to the FC16, so I can't give specifics on where the connections should be made.