Thanks for your replies.
However, I have already tried those. It seems to me that the Perspective, Unified Transform, and Handle Transform tools all more or less share the same underlying functionality that has been packaged slightly differently. They all behave in a like manner, which does not really apply to this case.
If the Shear tool allowed itself to be defined using non-parallel edges and included a one-directional scaling functionality, that would be of help. Unfortunately, that is not the case.
However, I have already tried those. It seems to me that the Perspective, Unified Transform, and Handle Transform tools all more or less share the same underlying functionality that has been packaged slightly differently. They all behave in a like manner, which does not really apply to this case.
If the Shear tool allowed itself to be defined using non-parallel edges and included a one-directional scaling functionality, that would be of help. Unfortunately, that is not the case.