A small correction to your text: In the chromachron version you posted for download, there is no vba included. That is why – unlike Jon’s version of the donut clock – it does not update automatically (only manually by pressing F9).

But you could easily insert Jon’s code into the chromachron sheet. All you have to do is changing the cell reference (F4 instead of D3). Furthermore: since it is a clock that does not show seconds, it is probably more than sufficient to update it every minute (or even every 5 minutes?). Your call.