Thank you for the question Kyle!
Our experts have a wide range of feedback. I will synopsize their comments below.
First, yes, you’re right. Making things as simple as possible for early readers is a major consideration. From this, we would want to limit the range of line types that we provide to early learners, with a preference for solid lines. If there is a reason for differentiation, dashed lines would be the second type.
If dashed lines are used, our experts recommend following GSTG 3.4.3.3 so that the length of each dash is 1/4″ to 3/8″ (6mm to 1cm), separated by spaces approximately one-half the length of the dash.
If dashed lines are to be reproduced using the embossing method, testing should be done with the specific embossers to be used because curved lines might not be as clear as desired for early learners.
Following GSTG 11.4.2, the design of the graphic for readers in kindergarten through grade 2 should include no more than three different line types, three different area textures, and three different point symbols. Graphics for grade 3 (and above) should have no more than five of each kind of symbol.
Consider adding labels or descriptive tactile notations to assist the reader with orientation.
We hope this helps!