I´m trying to accomplish the same structure.
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Inventory 1 = App Dsers for most products (dropshipping)
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Inventory 2 = Local inventory for fast shipping for a few top seller products
I´d like to create this second inventory and also define the shipping rates specifically for the products inside this inventory, for faster shipping for example.
I also think the problem is due to Dsers integration, it limits somehow other locations to work independently.
I´ve found one workaround but didn´t test fully for any flaws.
Inside Dsers (Settings > General Settings > Product > Product fulfillment service management) you can uncheck “shopify-fulfillment-service”, and leave only “dsers-fulfillment-service” enabled.
This way, you can go back to Shopify > Product and choose the variants you want to change the location for your local inventory.
And then you can go to Shopify > Inventory management and check for the products/variants available, than edit the quantity manually for each product.
As I said, don´t know all implications in doing this. For example, if my local inventory goes to zero, my product will show as “out of stock”. But the best way would be if Dsers was used as a backup inventory to replace my local inventory when it goes to zero.