I think those are all good resources, but I would be careful with pacing yourself! Three SRS at once can be very punishing. If you haven’t read it yet, I recommend checking out the ultimate guide to WK for tips on pacing yourself with WK. I would definitely not go full speed, but you can follow the same strategy, just with a smaller number of lessons a day. You’ll also want to be as consistent as possible with your pace with both WK and MNN (so, no huge lesson binges) so that you’ll have a predictable number of reviews coming in each day.
Aiming for about two weeks a level (about half full speed) works for me, and I try to get one MNN lesson done within that same time frame, and it has been a pretty good pace. However, it requires daily commitment, and at least an hour a day for SRS alone (Bunpro would probably add even more to this, since I don’t SRS grammar, only vocab/kanji. I practice grammar with physical workbooks instead). I usually study 2-3 hours a day, counting textbook exercises and active immersion (though the hour for SRS is my hard minimum, even if I’m extremely busy or ill or otherwise don’t want to study). If you can’t spare this much time, then I would dial back even further on your WK pace, because you don’t want SRS to become the only thing you have time/energy for.
As far as resources go, though, you’ve covered most of your bases (kanji, vocab, grammar) with that combo (except for speaking and writing), which is good, because you want to aim for balance. At some point, you’ll want to start doing immersion, too, though you definitely don’t have to start on that right away.
The main thing to keep an eye out for, I think, is your WK speed and your speed working through MNN, since WK will determine the amount of reviews you’re getting in WK as well as some in Kitsun, and MNN will determine your Bunpro reviews and the rest of your Kitsun reviews. If it starts to get overwhelming, the way to hit the brakes is to slow down on adding new lessons in WK and/or slow down your progress through the textbook (while continuing to review old material). Definitely be wary of signs of burnout, because usually your SRS review numbers will lag a little behind your lessons, so you’ll want to slow down before you get overwhelmed, not after.
The advice I always give with WK is that you want to plan your daily workload around what you can accomplish in less than ideal circumstances, not ideal ones. In WK, because of the way the review intervals work, when you do lessons, you’ll still be feeling the effects of those lessons six months from now. If you’re having a great day and decide to do 40 lessons because you have the energy that day, those 40 reviews might resurface six months later when you’re sick or exhausted and don’t want to do a whole bunch of extra work. If that also happens to fall on a day where you added a bunch of textbook vocab to Kitsun, you might completely lose your motivation. Then the next day, a bunch more reviews get added to that pile, and it gets harder and harder to summon the willpower to do them.
But if you planned your workload to be lighter than what you can accomplish when you’re feeling at your best, then on days where it gets hard, you’ll really appreciate it, because it will be much easier to put in the work you need to keep going, especially if you’ve established a regular daily habit.
I don’t know how helpful all of this is, but this is how I’ve managed to keep going with three SRS (+ textbook study and immersion) every single day and avoid burnout.