So after seeing this story I decided to learn basic Shavian and, about 4 days in, I can read like a 3rd grader. I thought this might be a problem for Shavian, as well, but after experiencing it; it's really not.
Go check out something like a copy of Dune (https://shavian.weebly.com/uploads/1/0/2/1/10212142/dune_fir...) and turn it on its side (or even flip it over). It's not really an issue to immediately recognize what the right way up is. If nothing else, a single proper noun will give the entire game up.
It's not like Shavian is unique in that different orientations of the text can resemble proper letterforms. Many scripts have that and they're just fine.
Go check out something like a copy of Dune (https://shavian.weebly.com/uploads/1/0/2/1/10212142/dune_fir...) and turn it on its side (or even flip it over). It's not really an issue to immediately recognize what the right way up is. If nothing else, a single proper noun will give the entire game up.
It's not like Shavian is unique in that different orientations of the text can resemble proper letterforms. Many scripts have that and they're just fine.