You can have both connectors installed at the same time. When the legacy connector is installed, it will add a new set of companies for each of your GP databases and the naming will look like XXX-CURR. Then you'd just need to point your reports and trees to those -CURR companies. It's up to you if you want to then remove the datamart but you could essentially even set up two sets of reports, one for legacy and one for datamart if you wanted.
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