Flagging New vs. Repeat Customers

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We are trying to make a workflow for flagging repeat vs. new customers. There is no way to automate adding customers tags upon import, only order tags. This would be the ideal solution but the next option would make the process faster.

With our current workflow we manually tag our customers profiles and use the automations rules to add a note to those imported orders that do not have a "Repeat Customer" tag to flag them for separate marketing material. Currently we have to go through all of our customers every week and make sure the new customers have the "Repeat Customer" tag added. To make this more efficient under “Customer” section would it be possible to make the "tag" column so it could be sorted? Then we could sort out the new customers that do not have a tag yet.  If they were sorted then the untagged ones could be brought to the top of the list and bulk edited. Thanks!