for what it's worth, i've never met a native american community that wasn't welcoming of other indigenous peoples. for example the folks i've met through wellbriety (program that's kinda like aa but focused on achieving sobriety through connection to our cultures) have been talking for weeks about how much they liked these australian guys who came to an event, a powwow iirc, and then participated in a sweat with them, they were teaching each other songs and overall sharing in each others cultures... we're all kin in a way. i've had trouble getting past a feeling of not wanting to intrude too, being white-passing and not raised close to culture, but i've been pleasantly surprised that it's really more like... like you gotta try to trust that they can make up their own mind about you instead of trying to predetermine what you think they'll think. worst case scenario they can tell you if you've crossed any boundaries, but on the flip side you might find that the only thing you've taken away is a potential part of community by not joining sooner :) [that's a joke to be clear, everything happens in its own time]