I don’t have a clear idea of what this would be like to implement. I did want to second @mwra’s mention that the Attribute Browser is an enormously powerful tool. You can find an intro to it, and some examples of its use, in this thread and related links, from a few years ago.
The most complicated cross-linking I do is with words, text, tags, etc, more than with numerical data. But some of the same Attrib Br tools that work with text would have numerical applications as well. In case you hadn’t looked at it carefully, worth exploring.