Aftermarket triple clamps can be purchased for road bikes to allow this adjustment and remove the need to change ride heights instead.
Motorcycle triple clamp alignment.
You use a tape measure from the swing arm pivot bolt to rear axel.
The forks and triple clamp system is straight and true.
The height of the front of the motorcycle typically measured from one of the triple clamps and the height of the rear of the motorcycle.
So in addition to what you propose i would suggest you slack off the pinch bolt on the upper triple clamp securing it to the steering stem which holds the clamps in alignment or misalignment to allow it to rotate into alignment.
My handlebars were slightly out of whack after my bike went over last week.
Doing this will free up the front end even more.
To realign your front end you need to remove the front fairing and then the handlebar risers from the triple clamps.
You can not always trust the manufactures marks for the rear axel position 3.
The motorcycle wheels are straight and true.
Changes in spring preload tires rear shock location or linkage or changes achieved by moving the forks up or down in the triple clamps all change the respective ride heights.
Tighten the lower triple clamp.
Support the front of the bike so that the bike will not slide up or down when you start working.
This will insure the rear wheel is perpendicular to the swing arm pivot.
If the front end is still out of alignment then it s necessary to loosen the steering stem nut with a 32mm wrench.
The steering stem is one piece with the lower clamp.
The first thing you should do is figure out if the handlebars themselves are bent before you start messing with the alignment.