Although it gets awkward when someone wants to hold the paper for me while I sign. I have to gently tug it away from them so I can turn it.
I have the same problem when people want to hold the paper for me to sign.
This change my sophomore year in English class when my teacher told me a trick! Place a sticky note on the side of your hand that rests on the paper. No more smudging!
Solves the problem with the hand overlapping the fresh writing and produces some funky-looking text.
Only people that do that weird claw thing have that problem.
Anyway, no more handwriting these days...
I also do not write like this, smudging fresh ink as I write has never been an issue for me.
It's weirdly left slanted but actually better than my normal handwriting.
Or indeed, use vertical writing, which is particularly well-suited for left-handed use.
[1] https://en.wikipedia.org/wiki/Rotring
[2] https://en.wikipedia.org/wiki/Instituto_Argentino_de_Normali...
Also in languages written vertically and then right to left it would be less of an issue because the ink would have more time to dry before you get to the left of a given character.
My suggestion would be to just turn them around so the spiral is on the right side