The method I use to collect the preset name of a plugin is by issuing a "Save as..." command from within the plugin GUI itself. That usually open a dialog displaying the current preset's name in text already highlighted (ready to be renamed and relocated). At that moment, issuing a copy command (either via Automator or KM) in order to later on paste it upon saving it as an AU preset.
LogicPro 10.6 ( & 9.1.8),MainStage3.5
MBPro 17", Core2Duo, 8G, OSX 10.12.6
MacPro, Xeon 6Cores, 64GB, OSX 10.15.7
ULN8, MOTU MIDI TP-AV, C4, MCU Pro, KorgNano, Novation SLMkII
AAS, NI, Celemony, Spectrasonics, Korg, etc...
PC, iPad3(V-Control & LogicRemote), AtariST(Notator SL), Several vintage gear