I have been living in an HOA community for the past 2 years. I am not involved, I don’t attend HOA meetings (I keep intending to), but I would resent my money being spent irresponsibly and assume most of us care about a lawsuit that may cost money. I would want to know. Do you have a central mailbox area? We have several in our community and I see info flyers attached to those. Even if they were taken down, likely many people would see them before they were removed.
In my opinion, if you knock on doors, introduce yourself as a concerned neighbor, have a simple and objective flyer stating the facts and contact info, I would think that at least a percentage of your neighbors would be interested, I certainly would.