I will preface this with I am very supportive of time nerdery. I am thrilled that this person is build and documenting that build.

I will now commence shitposting, so please look away now.

Booo use a pendulum like a real time lord: https://gentsofleicester.com/project/alanb/

Obviously you really want a tank/vacuum master clock, but they are expensive and big. this GPO Type 46 however is small and more importantly gives off a pleasingly happy ticking noise. (tickety-a-tock, tickety-a-tock, then every 15 seconds a Clonk as the magnets fire)