How does Worldcoin plan to solve for people in wealthier countries not wanting to scan their eyeballs (because the UBI isn't meaningful enough)?

Likely through a long tail of value props beyond the financial incentive 

For example, apps that require proof of personhood to use them, or voting schemes that require you to verify as a unique human 

Also early adoption of new technology often happens in developed countries b/c it is seen as high status

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Rome, Metropolitan City of Rome Capital, Italy

What historical technology have been adopted in developing countries and then become the norm and high status in developed countries?

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That’s definitely developed to developing :)

Let me go a layer deeper. Mobile payments. 
Saw this first hand when I was in Kenya. They culturally adapted to mobile payments years before the developed world. 

2 reasons as to why this happened:

1) Farmers couldn't pay their bills on time, which led the initiative to make it easier

2) Less regulation to implement