On the past few days I've been collaborating with Howard Constantine of Oscilloscope Clocks and Nixie Clocks at http://oscilloscopeclocknixiecrt.com/. Howard produces, as the name says, Oscilloscope and Nixie clocks and the GPS enabled models are now certified as nwts compatible.
Howard has tested nwts with his Kickstarter Nixie Clock VII and it works with very minimal modifications.
nwts can be fitted under the clock. Howard's instructions couldn't be clearer:
Thank you Howard!