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The airtag case doesn't have a gap large enough to allow a regular wire to pass through. I guess you'd need to drill the cover, or just discard the cover and use tape. Then you could use one of these dummy batteries:

https://www.aliexpress.us/w/wholesale-cr2032-dummy.html

is that a purchasable product? link? Thank you in advance!

That white clock looks cool. What's the name?

Looks like Xiaomi Mi Temperature and Humidity Monitor Pro.

Just in case you're looking for the exact model, it's: LYWSD02MMC

I have a dozen of those style temperature gauges all over my house. Mine are actually a slightly smaller, square version. You can use Home Assistant to read the Bluetooth temperature and humidity readings from them. They ended up costing maybe $3 each when buying several at a time. Battery tends to last a bit over a year.