All u-he plugins that support NKS have NKS export built in. At the moment this option is available in the VST2 plugin but not the VST3 but the exported patches will load in the VST3 on Mac, on Windows you still need to use the VST2 version for NKS (except, I believe, with Diva)
First you need to give the patches a bankname in the plugin’s own browser by selecting them all and dragging them onto the bank field and filling out the bank name when prompted to (this ensures they won’t get mixed up with the other plugin factory NKS when you import them into KK)
Then right click on the save button in the plugin browser and switch the save as format to nksf.
Then select the whole bank and right click on the selected patches and choose export to nksf
Finally update the Komplete Kontrol database for the plugin in KK settings
Many u-he expansions already have NKS versions but most third party ones won’t