If your job is important to you, you should go for fully weight-bearing internals.
If this is too expensive, do unilateral lengthening with frames (one leg at a time). A tailor can easily add some elastic fabric to each leg of your trousers so you can hide the frames easily. For the leg discrepancy get some insoles for each centimeter.
I can tell you from my personal experience, that you won't be able to go to work, school, etc shortly after surgery.
I'm a university student and I lost my not so important part-time job (a desk job) because I was sitting in a wheelchair and obviously had a lot of pain while working.
I got the same job again once I only needed a single crutch to move around.
You will be bad-tempered and you will only be able to think about leg lengthening, you won't be any productive at all and rather be a burden to every person around you instead.
How are you planning to go from your house to the working place? You can't drive a car. How to reach your desk? Slowly limping down the hallway with your walker while making groaning sounds every time you move? Are there elevators and is the interior of you workplace suitable for wheelchairs? What about the restrooms? Doing a wee-wee will cost you and your employer about 15 minutes. You will have to turn the screws on your fixators several times a day and to take your medication. What about your crucial daily exercises? How many hours will it be each day that you are at work, but in fact are not working?
You will have to take some time off work for the lengthening phase.
I think the best fake story is still a traffic accident in which your legs got smashed. Things like that really happen.
But your story wont hold up if the people around you start to notice you getting taller and taller, which is another good reason to not be at work during that time.
It only works for people how don't see you that often.
