As other already said there is more issues than you want to handle with your requirements. Can you open more about your current setup, what you are really try to achieve with this new setup and where these sites are in geographically point of view. I didn’t understand your configurations and requirements based what you have told to us. We definitely need more information where you are put nodes and how those are located currently. E.g. you have site_search_factor 2 and you want that SHC nodes are searching only on local site. You don’t tell if your current SHC node is only on site8 or not? Based on your requirements this she that way. Then you want add additional SHC nodes into site12. Why you have indexers on 4 in future 8 site, but use only two sites data for searching? How many indexers you have per site and how many SHCs you totally have and in which sites? Why you want to put new indexers into old removed site1? Why you have that site definition in general?
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