I don't see the problem. The car runs straight and steers as it should. So I assume the alignment is done correct. If you replace the steeringwheel on the splined shaft a few teeth, you don't mess with the alignment or steeringbox I guess ?
I'll do my best to stay on track here...
The steering box needs to be centered first then alignment done with that in the center position or it will not sit right on the pinion & sector shaft center point causing return to center/neutral driving.
When I did alignments, I would center the box, then use the drivers' seat belt to lock the steering wheel in position then check the alignment check on the car
I unlocked the wheel to do the caster/camber checks/adjustments.
Made preliminary adjustments then once close to done locked the wheel and made sure it looked good on the rack.
Set the toe in then test drove & then made note of the steering wheel position.
If I had to would make sleeve adjustments to make the final finesse adjustments so the customer would be happy.
nothing worse than a steering hweel off the center position...
Road test afterwards making small tie rod sleeve adjustments if there was a pull and only after switching the tires either side to side in the front or front to back.
If it does then it is tires which is no big deal unless they are worn strangely.
You can test the box for center position by jacking the front up and turning the wheel full end to end(left to right) counting the number of rotations from left to right then dividing it in 2 giving yo the center position.
A lot of inexperienced or hack alignment mechanics would pull the steering wheel and change the position but this is not the way to go for a good alignment.
If you do the quick end to end test and find the car turns left or right then first remove the horn button and see if the factory spline notches line up
The splines & notches are there for a reason which is to center things for proper steering geometry left thru right...
If they do lineup then move onto the sleeve adjustment which will likely fix what you have or even as mentioned above, swap the tires side to side to see if it changes the pull while driving down the road.
If the steering wheel is not lined up, then fix that first and then road test & if still an issue or worse make the sleeve adjustments until you are happy with the drive and position of the wheel