How do you find not-quite-club level human opponents to regularly play bridge with?
Your question intrigues me because I'm an oddity--a purely sociable bridge player who has written about bridge history and I've done a lot of THINKING about bridge as popular culture--where it is, where it's going, what it needs to do if it is ever to become the mass fad it once was.  My experience writing a book about the pop culture of sociable bridge, and a blogezine as well (http://bridgetable.net), tells me you're not alone. You have lots of kindred spirits out there. There's much dissatisfaction with the bridge Establishment and today's bridge world. 

I think the only answer is YOU (with others) organizing something (via the internet and Meet Up) between the world of sociable players (like me) who have no organization whatever AND the ACBL world. 

Launch a website, come up with a set of standards/rules for your ideal way of playing duplicate bridge that would be good for your young son as well, give it a catchy name, and start and promote to people who agree with you. Who knows, you could be the creator of something new in bridge that goes national at some point. Who knows? Maybe someone else with feelings like you has already launched a website to reach others like you? Read again about Ely Culbertson--he told the bridge Estabishment to go to hell and just promoted bridge the way he knew it would work rather than go along with the Establishment. He's my hero.

I'll bet if you Googled "How to start a national organization via the internet" you'd find all kinds of instructions. Come to think of it--I should do that myself for MY "cause" too! 

Create a few Google Alerts of selected key words and phrases and see what you find. That's how I find content for my blog, I have Google Alerts for "play bridge" and "nonagenarian" (because part 4 of my blog is looking for bridge-playing 90-plussers, and do I ever find them!!) That's how I found you in fact.

I'll bet a Google Alert for "play duplicate bridge" and "play duplicate bridge without masters points" or even the words you used in your question "play less intense duplicate bridge" -- do that for a month and see what you come up with. Can create as many Google Alerts as you want.

My progress with my cause (that sociable bridge survive after the bridge-playing old ladies like me (91) are dead and gone) goes slowly. BUT I'm OLD and TECH ILLITERATE (have to have a Virtual Assistant or I could never do a blog) while YOU are YOUNG and like most of the young into twittering and facebook and all that stuff I loathe doing. Even so, got a couple of very good breaks these past two weeks that may make a huge difference eventually in my subscriber list. Anyway, what I do is one of my bucket list causes and makes life interesting for a nonagenarian.