Welcome, and congratulations for choosing to take this path for your health.
You should not have any problem converting your metabolism to a primarily fat-burning one, even without much exercise. I have heard that exercise speeds up the process by depleting your glycogen stores, but they will run out anyway if you eat very low carb for a few days.
Make sure you eat enough fat (preferably animal fat, it's healthier) and very low carb, and your body will be forced to adapt.
I think it's great that you've decided to do this.
Try to stick to very-low-carb for at least a month or more, if you can. That gives your body time to fully adapt. There can be some performance loss while the body adapts, but after 2-3 weeks, you will be back, as good as ever and possibly better.
Plus, if you stick with very-low-carb long enough for your body to adapt, it will learn those metabolic pathways and it will be easier to return to that metabolism in the future, or to slip in and out of it intermittently as needed.