Meeting security - best settings

I'm having a meeting where I'm inviting about 25 people, but encouraging those people to forward the invitation to friends of theirs who might be interested.  If I'm lucky, I'll get 50 people to the meeting.  I'm encouraging people to let me know if they plan to log into the meeting, but I'm not having much success at getting responses, and I want people to be there, so I don't want to mandate that they respond.

I am somewhat concerned about Zoom bombing.

Trying to figure out best security settings:

1. Password:  no brainer.
2. Only allow authenticated users to join:  I think this will create all sorts of problems.  Some of the likely attendees are not all that tech savvy.  I don't think I can use this.
3. Waiting room:  Problem here is that I may not know a friend of a friend, so if I have John Smith in the waiting room, I either have to quiz him about who he is, or I just let him in and hope for the best.  And if "iPhone 9" joins, good luck....  So in practice, the waiting room seems like it might add lots of fiddly decisions and stress.
4. I can only allow participants from particular countries.  There will definitely be people from half-a-dozen countries on the call, and I could allow only those countries.  That leaves a possibility that someone's friend dials in from a country not on the list, but that's probably a small risk.  This is helpful if I know that most Zoom bombing arises from countries outside this list, but if most Zoom bombing comes from within the US, Canada, UK..., it won't do much to help me.

So I seem to be stuck with using a password only, and hoping that no one is dumb enough to post the invitation on social media where it can be seen?   Any words of wisdom on how to proceed, and how much risk of Zoom bombing there actually is?