To prevent the other worlds from being real enough to have people inside them,

In RQM, there are no other worlds in the MWI sense. MWI allows observers to make contradictory measurements, such as |up> and |down> and then tries to remove the contradiction by indexing each measurement to its own world. rQM does not allow observers to make contradictory measurements, so there is no need to wish away worlds, because there was never a need to introduce them.

"However, the comparison does not lead to contradiction because the comparison is itself a physical process that must be understood in the context of quantum mechanics. Indeed, O′ can physically interact with the electron and then with the l.e.d. (or, equivalently, the other way around). If, for instance, he finds the spin of the electron up, quantum mechanics predicts that he will then consistently find the l.e.d. on (because in the first measurement the state of the composite system collapses on its [spin up/l.e.d. on] component). That is, the multiplicity of accounts leads to no contradiction precisely because the comparison between different accounts can only be a physical quantum interaction. This internal self-consistency of the quantum formalism is general, and it is perhaps its most remarkable aspect. This self consistency is taken in relational quantum mechanics as a strong indication of the relational nature of the world." --SEP

we need to insist very loudly that this whole diagram of what is 'real relative to' other things, is not itself real. I

rQM has an ontology. It's an ontology of relations. rQM denies state -- non-relational infmoration. rQM does not need to say anything is real relativee to anything else -- only that some information is not available to some systems.

Also, since only individual points in configuration space allow one particle to say that another particle is in an exact position and have this be 'real', if you take a blob of amplitude large enough to contain a person's causal process, you will find that elements of a person disagree about what is real relative to them...

I have no idea what that means.