I must apologize for the delay in answering you.
Thank you for attaching the print. It is very helpful.
I think you must use the combined signature, following print. Use the dots 346 plus-sign between the 3/8 and the 3/4, without spaces. It seems evident that the dotted bar line separates part-measure units, not whole measures. Where a dotted bar sign falls at the end of a braille line, I think that it serves to indicate that the measure is incomplete, and a music hyphen is not required. Your alignment of the dotted-bar signs and use of guide dots seem perfectly correct to me.
I hope I've been clear. If not, please feel free to ask again.
Cheers to you.