Was also thinking about installing the new satnav. Theoretically it should be swappable if you can get the N-Software for the manual transmission.
Seeing as barely anything has changed visually around the old/new unit (gauge cluster, dashboard, etc.) it could be rather easy if the wiring hasn't change (which is unlikely because it's only a facelift).
As soon as my dealership is open again I'm going to ask them about it. But keep in mind that we'll have to wait for the release of the facelifted N to get the proper software for ours.