There are multiple threads about this, but none seem to really answer the question.

How can I create a Link Group in Workflow?

I have several documents coming into the repository at the same time that share a field value.  I'm using advanced search query to find all docs with that field value, then I'd like to create a Link Group with all of them.

There isn't an activity that will accomplish it, since "Create Link" only creates one-to-one links (relationships), not Link Groups.  In my mind, this just leaves the option of an SDK script.  Anyone ever put together such a script that you would be willing to share?  Outside that, anyone have another option?