I hope it goes great and would love to hear how it goes! 
The book Goetia Pathworking by Corwin Hargrove might fit well - it uses a form of working that needs no tools or over ritual, closer to shamanic journeying, so it’s possible to do when a ritual could cause suspicion… and it’s the author that discovered Foras can help you understand a loved one.
We have a book recommendations thread that collects some of the books discussed on the forum over the years s well…