Hi Rob, you don’t want to be running like that, particularly if you are - and I don’t think you’ve stated either way, but I’m assuming - overweight.
Running should be 80-90% very easy, about 10% hard (tempo and/or intervals). So, in every hour run, about six minutes hard work. 50/50 is an express train to injury, and with extra luggage it could be a hard landing.
If you are overweight, you have been eating more food than you need to maintain that high body fat percentage. Simply reducing it to all you need will lead to some weight loss. Eating a healthy diet will also reduce excess body fat, and make you healthier.
Can I ask what is driving you to aim at calories, and at a massive 1,000cal deficit (plus who knows more than that, given your body is used to eating much more than you need), while moving to a Build phase, AND adding a run plan that likely to injure you?