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A one sided grind is just begging for the blade to warp in heat treat. The best way to do that grind and avoid a warp is to grind after the HT is completely finished.
Doing one temper at 400 instead of two won't make any difference to the final hardness. If you want the blade harder you'll need to temper at a lower temp.
If you do get a warp the best time to remove it is as soon as possible. Even so, it is still probable that it will warp on the final quench. When that happens to me, I straighten during the temper cycles but it takes several temper cycles and many hours to accomplish (usually).
I think you're making a mistake to try so many new things on one knife. If it were me, I'd just HT the blade you have as it is and see what happens. On the next one I'd do the clay coating and grind the bevel after the HT was complete, much less chance of warping that way and easier to straighten if it does ...
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