As much as we would like to help you,
The feature you are requesting is not available on the theme currently, as all the sites in a multisite network is different, by default the logo link URL comes from the home URL of that specific site in the Network.
Although it is possible for you to achieve your request on the theme with code customization of the theme, it might effect other parts of the theme, like its design and some time its functionality.
It would be wise not to touch the code yourself if you do not have knowledge on programming,
Our suggestion to you is to hire a professional developer for your customization, so that your theme will no be effected in any way.
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