There isn't a way as of now in CHT.
Unless you just use the analog clock.
If you prefer MaxM, you may want to stick with that then.
If the reason you use it, is for the non flip clock especially.
I was working on a nonflip clock last night, as a matter of fact, which is why I can confirm that you would need to edit quite a bit of things to get it working on CHT 1.7.1.
My suggestion is to wait until one is integrated properly.
Instead of trying to hack one in, as you'll likely make it worse, not better.
Here is what I had working last night, and it's still not PERFECT!
But it does not flip, has no lines through the digits, and resembles a digital clock.
