I did! I’ve been finding it hard to keep my hand lettering consistent while drawing Back, so I gave a font another shot (using yourfonts.com; I had tried making one long ago, but my lettering is much better now and the font looks far superior to my old one). And yes, it does save a huge amount of time. I wish I had tried it (again) long ago.
I don’t think I will ever make it public, though. My lettering is something unique to my comics which I’ve spent years developing and I don’t really like the idea of other people using it.
Most of my lines are just a standard round brush with the thickness and pressure sensitivity tweaked until it feels good to me. Nothing special!