I'm trying to figure out why you would need starter strips in jars...
The bees will build parallel comb in any large enough space. If you place your jar's mouth in respect to bee space, they may build it in any orientation relative to the established comb in the rest of the hive, but parallel to other comb respective of the first comb built in the jar.
In other words, the bees build comb any way they want in my top bar hives. Without a guide they put comb in kind of a circular pattern. One comb in the center, combs next to them parallel, and the further away from center they start to diverge. 30 degrees or even 90!
Top bars are like Bonsai. You have to trim, train, and cull regularly.
"I know you understand what you think I said, but am not sure you understand that what you heard is not what I meant..."