As others have pointed out, your plan sounds unsustainable and looking for a “lazy” solution that relies on willpower seems like a completely wrongheaded approach.
First, you should start with a medical workup, to find out whether you are testosterone-deficient, one exercise session away from a heart attack, or anything else relevant.
It sounds like your job does not involve any physical activity, so I suggest you start volunteering regularly at something that does. You could be walking dogs at an animal shelter or loading and unloading trucks at a food pantry and getting free exercise with built-in distraction and purpose. Yes, this will take up some time, but maybe you can find a situation that you can stop off at for an hour on your way home from work.
There is plenty of research to back up reducing your carb intake. Don’t drink sweet beverages at all, even artificially sweetened ones. Don’t drink beer or much alcohol–a few glasses of red wine per week should be your limit. Don’t eat bread, pasta, cereal, rice, crackers, desserts, etc. But don’t go overboard and eliminate fruit or certain vegetables or whatever. Eating this way need not involve much extra effort. Instead of a sandwich, have a wrap or salad. Instead of a side of fries at a restaurant, ask for sauteed vegetables, a fruit cup, or a side salad. If you are cooking at home, try substituting sauteed cabbage for pasta in your favorite dishes or chick peas for rice.
Don’t eat so little at a time that you are still hungry, but learn to recognize the difference between hunger and still being able to eat more. It is natural to eat opportunistically, but since you are not in doubt as to when you might see food again, fight the urge to fill up when you have the chance.
Learn to recognize the difference between hunger and boredom. Do not browse through your food supply between meals looking for snacks to pass the time. Go for a walk or clean your house if you are tempted to forage in the kitchen.
You can easily get a bit of extra exercise at work by parking farther away from your building and using stairs instead of the elevator. Maybe there is a restroom you can use on a different floor. The stand-up treadmill desk is a good idea, but going from sitting all day to treadmilling all day seems kind of sudden and also could be a huge distraction from your work until you get used to it, which could make you quit before that happens. I’d set up an extra stand-up desk sans treadmill if space permits. You don’t have to stand stationary at it. You can wander around a bit while you think. Extended periods of sitting should definitely be eliminated for the health of your back, regardless of weight.
Good luck with your weight-loss goals, but do keep the bigger picture in mind, which should be developing healthier habits, not just shedding the excess weight as fast as possible, thinking you will start living differently after that happens. Changing your habits once is hard enough, why put yourself through it two separate times?