Umbrella of umbrellas

Is there a way of constructing an umbrella project featuring several other site-based umbrella projects.
When I meet another naturalist in the field I want to direct them to the appropriate regional site-based iNat project using a single QR code. This should take them to an iNat project page where they can immediately select the region where they(I) happen to be.
The Observation Requirements field will not accept the name of the other umbrella projects I seek, the field states “url slug” as an alternative - what’s a slug? - it doesn’t accept just the url

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No, the searches that two layers of umbrella projects would generated would put too much strain on iNat’s infrastructure, so an umbrella project cannot be a subproject of another umbrella project.

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