[burfog]

7 and Z have far less disruptive fixes.

For 7, just make the top long and the slash slanty. Don't do that for 1.

For Z, give the top a very slight curve, and optionally do the same for the bottom. That is, bend the middle of the line in toward the center of the letter. It might be enough to just imagine doing this, so that you don't end up with a curve going the other way. Give the 2 a proper curve instead of a sharp corner, and it will look different.

[gerdesj]

That's fine but the reason I use the extra bits is to try and make a character unambiguous for a reader who does not know my handwriting habits. In the case of Z I do both - your suggestion and put a bar across it. 2 gets a small loop at the bottom left.

[delhanty]

Or (for 7) as in [0]

>in Japan, Korea and Taiwan 7 is written as ① in the illustration to the right. [1]

[0] https://en.wikipedia.org/wiki/7#Evolution_of_the_glyph

[1] https://en.wikipedia.org/wiki/7#/media/File:Sevens.svg