Hi Julian. Don't know about Reddit, but you can probably find some groups on Facebook. I'm a member of a few there, but they are specific to my city and/or country (Australia). Some groups can be good, and others toxic, so your mileage may vary. In particular a Dads-only group can be a pretty good low-judgement venue for blokes.
My daughter (22) and son (20) are both ASD. My email is in my profile if you want to reach out. E.
I feel like it may be a good place to consolidate strategies.