I think I need, for lack of a better description, a next-level container...

The same customer might visit under different Adobe IDs. Let's say I capture the customer account in an eVar. How can I segment on that account ID when the largest container available is "visitor", which is based on the Adobe ID?

For example, separating Purchasers and Non-purchasers is not possible by Adobe ID, as the same account might do a part of the journey under one Adobe ID and another part under another.

I am fairly certain it's a common situation, so there's got to be a solution, but I can't seem to figure it out.

Any suggestions?