Duplicate fields when setting up a universal process interface block

Proposal based on the video https://youtu.be/G0Tix_f_3VA. Make it so that it is simply physically impossible to create “duplicates” of fields in universal blocks? Well, i.e. if one of the fields has already been used in one universal block, then it will simply not be available in another universal block. It will be highlighted in some color, and when you try to select it, an information window pops up saying that the field is already in use and if you select it in this block, it will be excluded from the other one.