Welcome to the forum!
It’s been a while since I was involved full-time with environmental education and nature-based summer camps, but for quite a few years I taught after school nature/science classes for pretty much every social/economic/racial group in San Fransisco (much of it grant funded in communities and schools with fewer resources). My colleague and I also taught some nature photography summer camps for middle schoolers, and we were able to bring aboard some campers from immigrant communities via scholarships. However, they knew us from our teaching throughout the school year, which was a big help in getting buy in from them and their families. I think those camps were the most fun I’ve ever had as an educator.
We also partnered with ROCK for a time, to provide some nature and biodiversity based options for their outings with middle schoolers.
This is all mainly to say that I have some experience here, and it’s an area I feel quite passionate about, so as an iNat staff member I’d be happy to work with you on our end. Unfortunately I’m not familiar with any successful models at the moment, but happy to ask around. If anyone else has some suggestions, please chime in.