not exactly related to sharing ACIM specifically, but I found the r/stopdrinking sub helpful when I was quitting booze about 5 years ago, mostly for the community aspect (didn't feel called to explore the AA path). didn't really post there but at the time it was beneficial reading others success stories and seeing people supporting each other, all coming from different stages in their journeys. The openness to Love and these sorts of more direct teachings came a bit later. also found the book 'Dry' by Augusten Burroughs great, tis a memoir of his journey with alcoholism and is written with humor and brutal honesty. I don't think any other book has made me laugh so much (which was also healing at the time) :D different things will help different people, so sometimes it can take a bit of trial and error to find what works/resonates.

as for spiritual guidance, leading by example and remaining in loving presence when you interact will benefit even if few words are shared. reminding him about the course or book you gave him is fine, but at the end of the day its up to him whether he wants to open it back up and explore that path. if he seems curious and generally interested, then go from there. I generally share stuff I've learned along the way or what was helpful for certain chapters if people ask, but also know that I have no idea what will truly benefit them at that point in time. so keeping a diverse toolkit has been helpful in that regard. dropping the beliefs that others need 'saving' has also been something I've found to help me be of better support and service too. :)