The issue with keeping the weight on the inside of the right leg during the backswing is that it internally rotates the right hip and makes that hip the pivot point of the hip turn. Not only does it move the hips closer to the ball position but it doesn't give the left hip and leg a brace to pull against during transition. Consequently the player has difficulty with hip rotation and ends up sliding at best which results in a body stall and a flip release.
I don't doubt that some or even many would consider the idea taboo. On the other hand sloppy right leg action with the knee buckled out (or overly straight) and weight on the outside of the right foot isn't encouraged either. Anything which will assist in getting back to square a bit earlier on the down swing can only help at the moment even if it is a crutch.
I am pleased to report that working on getting my weight onto the inside of the left foot early in the downswing has coincided with a significant reduction in hip and lower left back pain. Whether I have stopped hurting myself remains to be seen.
It is this situation which puts the lower spine at risk because the lumber spine needs to be in nutation with the pelvis (solidly joined together during transition - referred to as nutation) to withstand the shear forces generated during the downswing.
The correct movements during the backswing is for the trail hip and leg to rote clockwise, the target hip and leg also rotate clockwise with both feet and ankles resisting. The spine and ribcage also rotate clockwise with the upper spine extending as the spine reaches full rotation. Some pros feel the weight on the outside of the trail heel and the big toe in the air. The leg is straight and extended with the knee pointing outside the trail foot.
The transition has the target leg and hip rotating counterclockwise while the trail hip retains its clockwise position. This action with the left hip and leg needs to be fast, as if hitting the ball with the left knee. When the left foot hits the ground the tailbone is rotated away from the target using the resistance of the ground.
The normal swing takes about one second and the forward swing less than half of a second. So there is no time to
connsciously control these movements. They have to be learned and practiced through repetition, mostly without a ball. It took me years to own them in my own swing.
I hope this brief summary helps with your quest. Cheers