I don't think there is a workaround, Lightroom catalogs are not allowed to be on a network.
There are other image management programs that do allow their catalog to be on a network, perhaps you should investigate those.
As dj already said, there is no workaround. The catalog is a SQL database that is not designed for multi-user access.
What other programs should we look into?
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The only one I know of is called Daminion (note: I am not recommending it, as I have never used it, I simply point out that they claim to allow multi-user catalogs on network drives). As for other choices, I'm sure Google can find them.