Very simple mod to add a RLN5382C MUC display module to the WPLN4111 SUC...have one myself that I did years ago (below). The same display module can be used with the APX WPLN7080 SUC by adapting the three wires to the RJ11 jack on the back of the charger.
I don't believe it's possible to add a display module to the APX NNTN8860 IMPRES 2 SUC. The two USB ports are for charging accessories only, not for communicating with the charger, and the third is the Programming/Fleet Management Port that connects to the NNTN8870 Reprogramming and Fleet Management Module. They did away with the RJ11 jack that the IMPRES 1 SUC had, which as noted above a display module can plug into directly. Whether there is an internal mod to solder the display module's wires to, or a hack for the Programming port, I haven't seen any yet.
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