Welcome back brother!
Personally, I think that's a perfect starting point. We're looking to reduce bodyfat/weight here ... people almost overestimate the amount of calories they actually need. If calories turn out to be too low, I'd rather start lower and at least make some progress, slowly taper up if I have to, vs. wasting time eating too much, not seeing results, and getting frustrated.
I understand why you're doing it, but I would ditch the Dextrose. In no way, shape, or form is that going to help you achieve your primary goal. Don't worry about maintaining muscle mass - there are far better (not to mention satiating) options - you mentioned oats; that'd be my choice.
Secondly - seeing as you're training fasted (for the most part), I'd at the very least go with a protein blend here vs. whey (again, I get the whey/dextrose fast acting bla bla bla ... personally I think it's overhyped, and the supposed benefits aren't worth it), even better would be some real food if possible.
Re: fasted training ... note my comments on your last meal.
Again, I'd personally opt for a protein blend if you're going with a shake here.
Essentially, your pre-workout meal is you last meal from the evening prior. If possible, I'd go with something with a bit more 'sustenance', not to mention satiating: beef, pork, chicken, etc. If you're going to stick with the eggs, at least eat whole eggs and drop the flax here. You can buy omega-3 eggs if you really feel it matters to you.
FYI - there's really nothing "wrong" here, I'm just making minor critiques that may help you train a bit more intensely, and may make your diet a bit more doable. Bottom line is you already know what to do - eat right, train, and rest - and do all 3 consistently - you'll be back in no time.
