Fair point.
But bigger people also lose more faster as well (without knowing Tuertos size I'm taking a bit of a stab there)
To answer the OP
I tried a similar thing but work and covid etc wiped it out before I got going.
Been taking the dog out 3 times a day and I've increased the walking distance, and I walk a fair bit in work done 17k steps today with one small walk for the dog before work and a nice one just now..got a little one to do later.. I've ordered a smart watch as well just a cheap one to see how I get on/how long/often I use it before going for a better one. Gonna ease into the eating, and similar to you it's just going to mainly be minimising carbs.
Do plan on a few runs a week as well, but need to work up from zero on that!!!