Just be human. It's extremely difficult to drop all carbs.. Trust me on this. The only way I was able to do it is with a full carb loading day. But if you must, not that it's necessary, just have whatever you want for that meal. You may feel the motivation now, as we all start off a keto with, but once you really start up, the cravings kick in, BIGTIME. That's your body telling you to refuel!
The problem I see with that plan is that there's almost no attention to using carbs to your advantage. Yes, keto is protein sparing, but there's A LOT of benefits from incorperating the carb ups.. ESPECIALLY when your thyroid output is concerned. Without adequate carb ups, your thyroid (metabolism) will just keep free fallin'.. You'll end up noticing that the scale will stop moving, even when you're putting yourself further and further in the hole deficit wise.
I don't know if a single cheat meal is near enough. It's not worth the drop in performance you WILL end up having without carbs. I've seen a lot of regular diets with balanced macros have a carbup meal every 3-4 days. But keto diets generally speaking still needs carbs. Once your body switches over, you're set. Glycogen fills back up, but the knock out of ketosis is short. Agressive keto's like what Dave recommends IMHO looks more for people doing contest prep vs. general fat loss. I'm basing my opinion on the fact that he doesn't want you to have ANY carbs for 41 out of 42 meals per week.
But, that's just me. It sounds like you're attacking this like a madman right out the chute lol. If you can hack it, go for it!
Only training advice I know works extremely well with keto is to keep volume LOW and heavy.. Cardio, do NOT do HIIT. Just walk the pounds off.