Answer:
There are some great sample documents, including some sample letters, in this document:
http://kids-alliance.org/wp-content/uploads/2013/12/PCM_WEB_April2014.pdf
This manual is designed to support implementation of California’s partial credit law for foster youth (which now includes homeless youth), but much of it is applicable – or could be modified – for ESSA’s requirements on homeless youth. In particular, see pages 15 and page 19 for sample letters.
We will have more tools on this subject to share in 2017.