Linking [autopattr] between different patches

Hello everybody,
I have an old project made of two independent patches. At the moment, I have a [preset] in each patch to control parameters, and I switch between "scenes" using a third small patch which sends the scene number to the other two patches.

Here's an example of what I have so far:

Patch 1 contains some parameters and a [preset]

Patch 2 contains some other parameters and another [preset]

Patch 3 sends scene numbers to the previous [preset]s

Using this method, I have to save changes separately for each patch, write two preset files, recall two preset files each time, etc. an easy way to make mistakes and oversights!

Now I'm moving to solution based on pattrstorage, in order to have a more flexible data handling, and I was wondering about the possibility of having a unique pattrstorage in the "Preset Manager" patch to collect parameters from the other two patches, so I'd have only one global preset file, and that should make life easier.

By now, the only solution I found is using [pattrmarker] and creating and binding a [pattr] object for each parameter I want to store. I was wondering if there was any way to link directly an [autopattr] object to a [pattrstorage] residing in a different patch, but I don't seem to find it.
Thanks for any idea that may come.