I'm with bitflipper ... but if you want something quick, TTS-1 is quick to set up and light weight. Make yourself a few MIDI groove clips saved in your media folder. When you want a click track, insert TTS-1 and drag a MIDI groove clip in. Stretch it however far you want it to go. Leave it as MIDI if you haven't settled on a tempo, or freeze the track to get an audio stem.
It's faster than it sounds.
I would love to see a direct audio click track function, maybe even in the 'nome settings. But in the mean time ...