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@Dutch_Cheese
I think your theory is not correct.
If you do 0.5 x (28" - 26"), you'll find that the wheel radius is 1" less.
In casae you keep the 28" fork, the head tube drops around 1", but the rear wheel axle stays in the same position.
So, the BB lowers just by approx. 0.5".
However, if you also change the front fort to a 26" model, the head tube lowers another 1".
In that case the BB axle goes down by approx 1".
This is pure theory. I've never measured it. Measuring in real life will be the only correct way.
Besides the drop of the BB, also the seat angle gets steeper. Perhaps that can easily be corrected by sliding the saddle backwards on the post (or taking another seat post with more setback. But perhaps you will like the more forward saddle position and you don't have to change it at all.
Perhaps you also want to make the saddle deck level, because the nose goes down a bit.
With the smaller front wheel, the steering angle gets steeper.
The smaller front wheel has already effect on the trail, thus steering of the bike.