Distribute app side-by-side Store and Sideloaded

[AliveDevil]

So … I'm having a conceptual issue with how MSIX packages are installed/distributed.

There is the Microsoft Store, which forces me to use a specific common name certificate, with a specific publisher identifier. That's good, for what it's worth.

Now if I want to distribute that app separately from the store (direct website download) I need to either get a EV Code Sign Certificate with the same common name as the Store version or get screwed by the Package Family Name making everything disconnected.
Following situation:
App A, distributed on Store, has a publisher shared folder with App B, distributed on the Store.
Now if I'd side-load install App B there is no publisher shared folder anymore between the original App A from the store.
How am I supposed to support these scenarios?

Shared Publisher Cache Folder	App A Sideload	App A Store
App B Sideload	✔️	❌
App B Store	❌	✔️

So in half the cases the user, who may have installed the App A from the store, and App B from the website, experiences some frustrating issue with files not correctly being shared in publisher shared folders.

The MSIX Persistent Identity is no solution here, as the certificate used for signing the store package is self-signed, and won't ever be trusted by any machine.