How do you change A.O.D clock font?

[Android Central Question]

I'm quite new to Android phones, so I might have missed something!

I have found out how to change the colour of the clock on A.O.D and Lock Screen, however I haven't been able to find a way to change the font of the clock. The only way I have seen is to change the entire theme, which I don't particularly want to do!

So is there a way to change the font of the A.O.D and Lock Screen clocks? And if so, how do you do it?

Thank you in advance.